At least six people were killed in an explosion that ripped apart a passenger bus parked outside the gates of Karachi Cantonment Railway Station on Saturday.
The bus was scheduled to depart for Sargodha and caught fire after the explosion.
"There are reports of five people being killed in the blast. The injured have been shifted to Jinnah Hospital," said Ahmed Chinoy, the head of the Citizen Police Liaison Committee (CPLC).
At least 48 other people were also injured in the blast, with five of them said to be in critical condition, Jinnah Hospital officials said.
It was not immediately clear what had caused the blast, officials said, adding that a bomb disposal team was trying to determine whether it was caused by a bomb or an exploding compressed natural gas cylinder.
According to the Dawn newspaper, Karachi's Cantt Station is one of the busiest areas of the city. It is one of the main terminals for inter-city travel as well as outside the city. The bus and coach terminals right outside the station are also used by hundreds everyday for travel to different parts of the country. (ANI)