Europe's far-right political leaders campaigned Thursday in Prague, calling migration and Islam major threats to Europe as they sought to rally support ahead of the European Parliament elections next month.

Marine Le Pen, leader of France's far-right National Rally party and Geert Wilders, founder of the Dutch anti-Islam Party for Freedom, were the main draws for hundreds at downtown Wenceslas Square. Matteo Salvini, Italy's hard-line interior minister and leader of the anti-migrant League party, sent a video message.

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Czech extreme-right Freedom and Direct Democracy party (SPD) head Tomio Okamura, third left, leader of French National Rally Marine Le Pen, fourth left, leader of Dutch Party for Freedom Geert Wilders, fourth right, and others stand at a stage during the rally against "dictate of the European Union" organised by SPD in Prague, Czech Republic, Thursday, April 25, 2019. (Michal KamarytCTK via AP)

Europe's far-right political leaders campaigned Thursday in Prague, calling migration and Islam major threats to Europe as they sought to rally support ahead of the European Parliament elections next month.

From left to right leader of French National Rally Marine Le Pen, Czech extreme-right Freedom and Direct Democracy (SPD) head Tomio Okamura and leader of Dutch Party for Freedom Geert Wilders attend a press conference before the rally against "dictate of European Union" staged by SPD in Prague, Czech Republic, on Thursday, April 25, 2019. (Ondrej Deml(PhotographerCTK via AP)

All the far-right politicians denounced migration and Islam, linking them to terror attacks and criticizing the current European Union. They vowed their alliance would seek a radical change in how Europe is run.

Leader of Dutch Party for Freedom Geert Wilders, center, peers at the photographer, as leader of French National Front Marine Le Pen, left, and Czech far-right Freedom and Direct Democracy (SPD) head Tomio Okamura, right, sit by as they attend a press conference before the rally against "dictate of European Union" staged by SPD in Prague, Czech Republic,  Thursday, April 25, 2019. (Ondrej DemlCTK via AP)

Wilders, meanwhile, called the EU an undemocratic superstate that has been attempting "to erase our nation states."

From left to right: Gerolf Annemans, chairman of the Europe of Nations and Freedom (ENF) EP group, leader of French National Front Marine Le Pen, Czech far-right Freedom and Direct Democracy (SPD) head Tomio Okamura and leader of Dutch Party for Freedom Geert Wilders attend a press conference before the rally against "dictate of European Union" staged by SPD in Prague, Czech Republic,  Thursday, April 25, 2019. (Ondrej DemlCTK via AP)

"We don't want Islam here!" the crowd repeatedly chanted.

Czech extreme-right Freedom and Direct Democracy party (SPD) head Tomio Okamura, third left, leader of French National Rally Marine Le Pen, fourth left, leader of Dutch Party for Freedom Geert Wilders, fourth right, and others stand at a stage during the rally against "dictate of the European Union" organised by SPD in Prague, Czech Republic, Thursday, April 25, 2019. (Michal KamarytCTK via AP)

The Czech populist group is the most anti-migrant, anti-Muslim, anti-EU party in the Czech Republic. It has 22 seats in the country's 200-seat lower house of Parliament.

They attended a rally of the Freedom and Direct Democracy party, the Czech member of the Movement for a Europe of Nations and Freedom.

Czech extreme-right Freedom and Direct Democracy party (SPD) head Tomio Okamura, third left, leader of French National Rally Marine Le Pen, fourth left, leader of Dutch Party for Freedom Geert Wilders, fourth right, and others stand at a stage during the rally against "dictate of the European Union" organised by SPD in Prague, Czech Republic, Thursday, April 25, 2019. (Michal KamarytCTK via AP)

Czech extreme-right Freedom and Direct Democracy party (SPD) head Tomio Okamura, third left, leader of French National Rally Marine Le Pen, fourth left, leader of Dutch Party for Freedom Geert Wilders, fourth right, and others stand at a stage during the rally against "dictate of the European Union" organised by SPD in Prague, Czech Republic, Thursday, April 25, 2019. (Michal KamarytCTK via AP)

All the far-right politicians denounced migration and Islam, linking them to terror attacks and criticizing the current European Union. They vowed their alliance would seek a radical change in how Europe is run.

"The battle of Europe has begun," Le Pen announced. "Long live a Europe of sovereign nations."

She said the EU is to blame for flooding Europe with migrants who threaten to destroy the European nations.

From left to right leader of French National Rally Marine Le Pen, Czech extreme-right Freedom and Direct Democracy (SPD) head Tomio Okamura and leader of Dutch Party for Freedom Geert Wilders attend a press conference before the rally against "dictate of European Union" staged by SPD in Prague, Czech Republic, on Thursday, April 25, 2019. (Ondrej Deml(PhotographerCTK via AP)

From left to right leader of French National Rally Marine Le Pen, Czech extreme-right Freedom and Direct Democracy (SPD) head Tomio Okamura and leader of Dutch Party for Freedom Geert Wilders attend a press conference before the rally against "dictate of European Union" staged by SPD in Prague, Czech Republic, on Thursday, April 25, 2019. (Ondrej Deml(PhotographerCTK via AP)

Wilders, meanwhile, called the EU an undemocratic superstate that has been attempting "to erase our nation states."

"Today, we're fighting for our existence," Wilders said.

"Islam is a medieval cult that denies freedom to others," he said. "Islam and freedom are not compatible."

Leader of Dutch Party for Freedom Geert Wilders, center, peers at the photographer, as leader of French National Front Marine Le Pen, left, and Czech far-right Freedom and Direct Democracy (SPD) head Tomio Okamura, right, sit by as they attend a press conference before the rally against "dictate of European Union" staged by SPD in Prague, Czech Republic,  Thursday, April 25, 2019. (Ondrej DemlCTK via AP)

Leader of Dutch Party for Freedom Geert Wilders, center, peers at the photographer, as leader of French National Front Marine Le Pen, left, and Czech far-right Freedom and Direct Democracy (SPD) head Tomio Okamura, right, sit by as they attend a press conference before the rally against "dictate of European Union" staged by SPD in Prague, Czech Republic, Thursday, April 25, 2019. (Ondrej DemlCTK via AP)

"We don't want Islam here!" the crowd repeatedly chanted.

The rally was disrupted by protesters, who were pushed aside by riot police. Police said 10 people were detained but no one was injured.

Political experts say the May 23-26 elections for the European Parliament, which take place in the EU's 28 nations, could prove to be a tipping point in post-war European politics. Traditional political powerhouses on both the right and the left are expected to lose support as extremist, populist parties gain more clout.

From left to right: Gerolf Annemans, chairman of the Europe of Nations and Freedom (ENF) EP group, leader of French National Front Marine Le Pen, Czech far-right Freedom and Direct Democracy (SPD) head Tomio Okamura and leader of Dutch Party for Freedom Geert Wilders attend a press conference before the rally against "dictate of European Union" staged by SPD in Prague, Czech Republic,  Thursday, April 25, 2019. (Ondrej DemlCTK via AP)

From left to right: Gerolf Annemans, chairman of the Europe of Nations and Freedom (ENF) EP group, leader of French National Front Marine Le Pen, Czech far-right Freedom and Direct Democracy (SPD) head Tomio Okamura and leader of Dutch Party for Freedom Geert Wilders attend a press conference before the rally against "dictate of European Union" staged by SPD in Prague, Czech Republic, Thursday, April 25, 2019. (Ondrej DemlCTK via AP)

The Czech populist group is the most anti-migrant, anti-Muslim, anti-EU party in the Czech Republic. It has 22 seats in the country's 200-seat lower house of Parliament.

The party wants to ban Islam, which it calls an ideology of hate. Its chairman, Tomio Okamura, is currently a deputy speaker of the house.

The Czech Republic has not been hit like other EU nations by migration into Europe and only has a small, moderate Muslim community.

Czech extreme-right Freedom and Direct Democracy party (SPD) head Tomio Okamura, third left, leader of French National Rally Marine Le Pen, fourth left, leader of Dutch Party for Freedom Geert Wilders, fourth right, and others stand at a stage during the rally against "dictate of the European Union" organised by SPD in Prague, Czech Republic, Thursday, April 25, 2019. (Michal KamarytCTK via AP)

Czech extreme-right Freedom and Direct Democracy party (SPD) head Tomio Okamura, third left, leader of French National Rally Marine Le Pen, fourth left, leader of Dutch Party for Freedom Geert Wilders, fourth right, and others stand at a stage during the rally against "dictate of the European Union" organised by SPD in Prague, Czech Republic, Thursday, April 25, 2019. (Michal KamarytCTK via AP)