Authorities in northwestern Bosnia are threatening a curfew in two large local migrant camps to press the central government to relocate people to other parts of the country.

The local government in the region bordering Croatia says a “full blockade” of the badly congested Bira and Miral camps will start Friday and continue until the situation is resolved.

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Migrants wait in line to receive supplies from the Red Cross at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Authorities in northwestern Bosnia are threatening a curfew in two large local migrant camps to press the central government to relocate people to other parts of the country.

In this photo taken Wednesday, Nov. 13, 2019, migrants walk in the Vucjak refugee camp outside Bihac, northwestern Bosnia. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

That part of Bosnia has been swamped with thousands of migrants hoping to illegally cross into neighboring European Union member Croatia.

In this photo taken Wednesday, Nov. 13, 2019, a migrant speaks on a phone during the sunset in the Vucjak refugee camp outside Bihac, northwestern Bosnia. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

In this photo taken Wednesday, Nov. 13, 2019, a migrant speaks on a phone during the sunset in the Vucjak refugee camp outside Bihac, northwestern Bosnia. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

A migrant carries water at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

A migrant carries water at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

In this photo taken Wednesday, Nov. 13, 2019, migrants stand during the sunset in the Vucjak refugee camp outside Bihac, northwestern Bosnia. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

In this photo taken Wednesday, Nov. 13, 2019, migrants stand during the sunset in the Vucjak refugee camp outside Bihac, northwestern Bosnia. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants wait in line to receive supplies from the Red Cross at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants wait in line to receive supplies from the Red Cross at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants walk in the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants walk in the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

A migrant washes , at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

A migrant washes , at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants wait in front of the Bira refugee camp in Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants wait in front of the Bira refugee camp in Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

A migrant washes hair at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

A migrant washes hair at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants wait in line to receive supplies from the Red Cross at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants wait in line to receive supplies from the Red Cross at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants wash themselves at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants wash themselves at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

A migrant stands in the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

A migrant stands in the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants wait in line to receive supplies from the Red Cross at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants wait in line to receive supplies from the Red Cross at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants wait in line to receive supplies from the Red Cross at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants wait in line to receive supplies from the Red Cross at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

The camps, hosting some 2,000 people, near the towns of Bihac and Velika Kladusa are run by the International Organization for Migration.

Migrants wait in line to receive supplies from the Red Cross at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants wait in line to receive supplies from the Red Cross at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

That part of Bosnia has been swamped with thousands of migrants hoping to illegally cross into neighboring European Union member Croatia.

Local authorities say that from Friday no more people will be allowed into the camps, while only those heading towards the Croatian border will be allowed to leave.

In this photo taken Wednesday, Nov. 13, 2019, migrants walk in the Vucjak refugee camp outside Bihac, northwestern Bosnia. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

In this photo taken Wednesday, Nov. 13, 2019, migrants walk in the Vucjak refugee camp outside Bihac, northwestern Bosnia. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

In this photo taken Wednesday, Nov. 13, 2019, a migrant speaks on a phone during the sunset in the Vucjak refugee camp outside Bihac, northwestern Bosnia. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

In this photo taken Wednesday, Nov. 13, 2019, a migrant speaks on a phone during the sunset in the Vucjak refugee camp outside Bihac, northwestern Bosnia. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

A migrant carries water at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

A migrant carries water at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

In this photo taken Wednesday, Nov. 13, 2019, migrants stand during the sunset in the Vucjak refugee camp outside Bihac, northwestern Bosnia. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

In this photo taken Wednesday, Nov. 13, 2019, migrants stand during the sunset in the Vucjak refugee camp outside Bihac, northwestern Bosnia. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants wait in line to receive supplies from the Red Cross at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants wait in line to receive supplies from the Red Cross at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants walk in the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants walk in the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

A migrant washes , at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

A migrant washes , at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants wait in front of the Bira refugee camp in Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants wait in front of the Bira refugee camp in Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

A migrant washes hair at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

A migrant washes hair at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants wait in line to receive supplies from the Red Cross at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants wait in line to receive supplies from the Red Cross at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants wash themselves at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants wash themselves at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

A migrant stands in the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

A migrant stands in the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants wait in line to receive supplies from the Red Cross at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants wait in line to receive supplies from the Red Cross at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants wait in line to receive supplies from the Red Cross at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)

Migrants wait in line to receive supplies from the Red Cross at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Thursday, Nov. 14, 2019. The European Union's top migration official is warning Bosnian authorities of a likely humanitarian crisis this winter due to appalling conditions in overcrowded migrant camps in the country. (AP PhotoDarko Vojinovic)