Local officials in the southern Mexican state of Tabasco have blamed missing nails in the track for a train derailment which has killed at least six people.

Public Security Minister for Tabasco state Audomaro Martinez Zapata said thieves had "ransacked" the tracks of their nails and metal plaques.

Eight of the cargo train's 12 carriages came off the tracks on Sunday.

Twenty-two people were injured in the accident near Huimanguillo.

Catharina Moh reports: "Rescue workers could only reach the remote area by air and boat"

Tens of thousands of migrants board the train, known as La Bestia, or the Beast, each year in their attempt to reach the United States in search of better living conditions.

Rescue workers fear more people may still be trapped beneath the carriages.

(Source: BBC)