Relatives and family members of passengers travelling on Karachi-Lahore bound passenger train, wait for relief train to bring passengers of ill-fated train at Karachi railway station, Wednesday, July 13, 2005 in Pakistan
Pakistani officials say at least 120 people were killed when three passenger trains collided in southern Sindh province.

Police say hundreds of others were injured in the crash early Wednesday near Ghotki.  Officials say a train rear-ended another train that was in a station, derailing at least 13 carriages.  They say a third train then hit some of those carriages. 

Rescue workers are at the crash scene and searching for more bodies while the injured are receiving medical treatment.

Dozens of people have been killed in accidents on Pakistan's aging rail system over the past several  years.

Some information for this report provided by AP, AFP, Reuters.