At least three Serbian MPs have been injured after opposition members threw smoke grenades during a chaotic session inside the country’s parliament on Tuesday.

Politicians were seen on live television clashing with security and launching tear gas in an apparent show of support for student protestors.

Demonstrations sparked by a railway station roof collapse that killed 15 people four months ago have morphed into a wider movement that poses the biggest threat yet to the Serbian government.

One of the injured MPs suffered a stroke and is in a critical condition, according to the speaker. “Serbia is rising up for the regime to fall,” read a banner unfurled on the chamber floor.