The station master in the Greek city near where two trains collided on Tuesday night has been arrested, police said

At least 36 people have been killed after a passenger train and freight train collided, it's thought around 350 people were on the passenger service.

The Greek president has called the crash an "unimaginable tragedy" and three days of national mourning have been declared.

Rescuers are continuing to search for survivors at the crash scene near the city of Larissa.

The head of a railway union has told local media it's not clear what caused the crash, which is Greece’s deadliest in recent years.

passenger train, carrying 350 people, and a freight train crashed near the city of Larissa, in northern Greece on Tuesday night

The first four carriages of the passenger train were derailed and the first two caught fire

It is unknown exactly how many people have been killed, but local media say there are at least 36 casualties, with numbers expected to increase, and 72 people have been hospitalised

The fire brigade said temperatures exceeded 1,300C where a fire broke out, making identification of victims difficult

The station master of Larissa has been charged with manslaughter by negligence, but denies any wrongdoing and blames the accident on a possible technical failure

The president of Greece has described the crash as an “unimaginable tragedy” and three days of national mourning have been declared

Rescuers are continuing an ongoing search operation involving 150 firefighters, four cranes and forty ambulances (BBC)