Twelve people have been arrested in Serbia in connection with a roof collapse early this month at a train station in the northern city of Novi Sad that killed 15 people and severely injured two.

Skirmishes have erupted for a second day in the northern Serbian city of Novi Sad between police and opposition protesters demanding arrests over a deadly roof collapse at the city’s railway station earlier this month.

The High Prosecutors Office in the Serbian city of Novi Sad said on Thursday that 11 people were arrested in connection with the collapse of a railway station roof earlier this month that has left 15 people dead.