At least 17 people have died and another 40 have been injured in a train crash in Pakistan

Two trains collided early on Thursday morning
near Landhi railway station in the southern city of
Karachi.
Initial reports said that one of the trains had been
given the wrong signal and at least two carriages
had overturned following the crash.
But railway official Nasir Nazeer said the collision's
cause could not yet be determined.
All trains out of Karachi have been halted
temporarily and rescue workers are at the scene.
TV footage showed serious damage to the trains,
and local newspaper Dawn reported that many
people were trapped under the wreckage.
Train accidents are common in Pakistan, whose
extensive colonial-era railway network has
suffered from decades of decline.