Serbia's striking students and supporters of populist President Aleksandar Vucic held parallel rallies Saturday as both marked a major holiday in the country with notably contrasting messages. The student-led protest is the latest in a nationwide anti-graft movement that reflects mounting calls for fundamental political changes in the Balkan state, the AP reports, triggered after a concrete canopy on a railway station in the northern city of Novi Sad collapsed on Nov. 1, killing 15 people. The rally in the central industrial city of Kragujevac drew tens of thousands of people who, besides demanding justice over the tragedy, have been demanding that officials root out rampant endemic corruption and respect for the rule of law.