(ANSA-AFP) - BELGRADE, 29 DIC - Protesting students in Serbia on Sunday swapped massive street demonstrations for a push to collect citizens' signatures, to gauge whether they had support to demand snap parliamentary elections. A wave of large-scale student-led protests has gripped Serbia since November 2024, after the collapse of a railway station roof killed 16 people in Novi Sad, the country's second-largest city. The tragedy at the newly renovated station became a symbol of entrenched corruption, with demands for a transparent investigation escalating into calls for early elections -- which have so far been rejected by authorities. So far, three investigations have been launched into the fatal canopy collapse, but only one has resulted in an indictment confirmed by a court. However, the court ruled on Wednesday that there were no grounds to further prosecute the former construction minister who was suspected of a "serious crime against public safety". (ANSA-AFP).