NAWABSHAH, Pakistan — At least 30 people were killed and more than 100 injured when Pakistan Railways’ Hazara Express passenger train derailed Sunday, the BBC reports. The derailment occurred about 170 miles northeast of Karachi, Pakistan’s largest city and the train’s starting point. German broadcaster DW reports Rafique said the train was traveling at about 45 kilometers per hour (28 mph) at the time of the derailment, and suggested that possible reasons for the derailment were “a mechanical fault” or “it might be sabotage.