About 2,000 demonstrators gathered in Thessaloniki, northern Greece, on Thursday night to protest against the failures that led to a deadly rail disaster on Tuesday, police told French news agency AFP.
During the demonstration, some protesters threw stones and Molotov cocktails, but "calm has now returned," said a police spokesman in Thessaloniki, Greece's second largest city.
Protests were also held in Athens and in the central town of Larissa, scene of Tuesday night's rail disaster, caused by a collision between a goods train and a passenger train on the railway line between Athens and Thessaloniki.
Following the disaster, railway workers went on strike in protest against working conditions and what their unions described as failure to modernise the railway system.
Another one-day strike has been called for Friday.
