Turkish police detained at least 30 people in central Istanbul on Sunday as they tried to take part in a Pride March, which authorities had banned as part of a years-long clampdown on LGBTQ+ events, an opposition politician said.

Footage obtained by Reuters showed police scuffling with a group of activists holding rainbow flags in the city center before rounding them up and loading them into police vans.

Kezban Konukcu, a lawmaker from the pro-Kurdish DEM Party who attended the march, told Reuters that at least 30 people had been taken into custody.

Police did not immediately respond to a request for comment.

The Istanbul governor’s office had earlier deemed the march unlawful and said groups promoting the event were operating “illegally.”