Tens of thousands of people gathered in Novi Sad to commemorate the victims of a railway station disaster a year ago.
The rally also displayed discontent with the government of Serbian President Aleksandar Vucic.
The protesters believe that corruption and nepotism in state infrastructure projects with China led to fatal disregard of safety rules.
No one has been held responsible, though 13 people have been charged.
Author's summary: Serbia commemorates train station disaster anniversary.