At least five people are dead after a cargo train notorious for transporting Central American migrants hoping to reach the US derailed in southern Mexico, authorities have said.
Officials said at least 35 people were injured, 16 gravely. It is feared the death toll could rise.
An unknown number of people were also trapped, the Red Cross said.
Soldiers, marines and emergency workers were trying to access the remote crash site, which ambulances could not reach.
Officials were working to establish air or water access to the site.
Cesar Burelo Burelo, the head of civil protection for Mexico?s Tabasco state, said the derailment occurred early on Sunday in a remote area with no mobile phone coverage.
Mr Burelo said dozens of people had been on the train, which was moving north from the border of Guatemala.
The train, sometimes called ?the beast?, often carries hundreds of people on the roof as they undertake the risky journey to the US. (BBC)