Rescuers are clearing debris and using sniffer dogs to find possible survivors after a dilapidated building collapsed in India's financial capital of Mumbai, killing at least 12 people. Several people are feared trapped.

Fire official Ashok Talpade said dozens of rescuers worked overnight at the site where they have pulled out 11 survivors since the four-story building collapsed Tuesday. The survivors included a child who was treated at a hospital and later allowed to go home. Others remain hospitalized.

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Rescuers work at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRafiq Maqbool)

Rescuers are clearing debris and using sniffer dogs to find possible survivors after a dilapidated building collapsed in India's financial capital of Mumbai, killing at least 12 people. Several people are feared trapped.

Rescuers carry out a survivor from the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said.(AP PhotoRajanish Kakade)

The lane where the collapse occurred is too narrow for rescue vehicles, so equipment was carried by hand. People also formed a human chain to remove debris.

Rescuers carry the body of a victim at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRafiq Maqbool)

Rescuers carry the body of a victim at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRafiq Maqbool)

Women look from the windows as rescuers work at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRafiq Maqbool)

Women look from the windows as rescuers work at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRafiq Maqbool)

Rescuers work at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRafiq Maqbool)

Rescuers work at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRafiq Maqbool)

A woman looks from a window as rescuers work at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRafiq Maqbool)

A woman looks from a window as rescuers work at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRafiq Maqbool)

Rescuers work at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRafiq Maqbool)

Rescuers work at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRafiq Maqbool)

Rescuers carry the body of a victim at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRajanish Kakade)

Rescuers carry the body of a victim at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRajanish Kakade)

Rescuers carry out a survivor from the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRajanish Kakade)

Rescuers carry out a survivor from the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRajanish Kakade)

Rescuers carry out a survivor from the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRajanish Kakade)

Rescuers carry out a survivor from the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRajanish Kakade)

A 16-year-old girl trapped under a heavy door was taken out by rescuers who cut through iron beams and cleared debris using hydraulic cutters.

Rescuers work at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRafiq Maqbool)

Rescuers work at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRafiq Maqbool)

The lane where the collapse occurred is too narrow for rescue vehicles, so equipment was carried by hand. People also formed a human chain to remove debris.

Rescuers carry out a survivor from the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said.(AP PhotoRajanish Kakade)

Rescuers carry out a survivor from the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said.(AP PhotoRajanish Kakade)

Rescuers carry the body of a victim at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRafiq Maqbool)

Rescuers carry the body of a victim at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRafiq Maqbool)

Women look from the windows as rescuers work at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRafiq Maqbool)

Women look from the windows as rescuers work at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRafiq Maqbool)

Rescuers work at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRafiq Maqbool)

Rescuers work at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRafiq Maqbool)

A woman looks from a window as rescuers work at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRafiq Maqbool)

A woman looks from a window as rescuers work at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRafiq Maqbool)

Rescuers work at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRafiq Maqbool)

Rescuers work at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRafiq Maqbool)

Rescuers carry the body of a victim at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRajanish Kakade)

Rescuers carry the body of a victim at the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRajanish Kakade)

Rescuers carry out a survivor from the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRajanish Kakade)

Rescuers carry out a survivor from the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRajanish Kakade)

Rescuers carry out a survivor from the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRajanish Kakade)

Rescuers carry out a survivor from the site of a building that collapsed in Mumbai, India, Tuesday, July 16, 2019. A four-story residential building collapsed Tuesday in a crowded neighborhood in Mumbai, India's financial and entertainment capital, and several people were feared trapped in the rubble, an official said. (AP PhotoRajanish Kakade)