Serbian Prime Minister officially resigns over the tragedy in Novi Sad
In 30 days a new government may be formed or else early elections will be declared
Serbs complain that a sonic weapon was used to “break up” the demonstrations
Footage from Saturday's demonstration shows people standing during a 15-minute silence in honor of the train station victims, when a sudden piercing sound causes panic
Students in Serbia blocked public broadcasting – Anti-government protests continue
Young people lead the protests after the tragedy in Novi Sad with the fall of the railway station roof that caused 15 deaths