PRAGUE — In the largest demonstration in the Czech Republic since the fall of the Iron Curtain, hundreds of thousands of people took to the streets on Sunday calling for the resignation of Prime Minister Andrej Babis.

The police and the interior ministry estimated that by 5 p.m., more than 200,000 people had arrived for the demonstrations, with thousands more still making their way to Letna Park, which sits on a hill high above the banks of the Vltava river and has commanding views of the old town.

Known around the world for its baroque architecture, Gothic churches and famed spires, the Czech capital was a sea of European Union and Czech flags, with parents bringing their children to the place where in 1989, some 750,000 people protested before declaring a general nationwide strike on Nov. 27, 1989.

“We want to bring decency and commitment to the public service back to the Czech Republic,” said Magdalena Kascak, 39. “I am not sure they will resign, but it will at least shine light at the public discontent and help energize the society.”