Two passenger trains have collided in southern Pakistan.
Local police say at least 40 passengers have died and more than 50 others have been injured.
The railways' poor safety record has become an issue.
Authorities say dozens of passengers are trapped inside the trains in the southern province of Sindh.
Police and others are continuing rescue operations.
Local media quoted railway officials as saying one of the passenger trains may have derailed and collided with an oncoming train.
Transport authorities are investigating the cause of the accident.
Observers say train accidents frequently occur in Pakistan because trains and equipment are outdated.