18 killed in Pakistan after train hits bus, splitting it in 2

At least 18 people were killed and dozens more injured when a passenger train rammed into a bus on Friday in Pakistan's southern Sindh province, officials said.

The incident took place in Sukkur district, where the incoming Pakistan Express - on its way from Karachi to Lahore - hit the bus, which was heading to Sargodha in central Punjab province.

"At least 18 people have been killed and 55 wounded," said Rana Adeel, a deputy commissioner in Sukkur, warning that the death toll could rise as some of those hurt were in critical condition.

Senior railway official Tariq Kolachi, who was at the scene, confirmed the death toll and said the rescue operation was ongoing but complicated by the darkness.

Kolachi said the accident occurred at an unstaffed railway crossing, and the bus split into two because of the force of the crash.

"All those killed and injured were passengers from the coach," he said, adding that an assistant train driver sustained minor injuries.

Rail accidents are common in Pakistan, which inherited thousands of kilometres of track and trains from former colonial power Britain.

The railways have seen decades of decline due to corruption, mismanagement and lack of investment.