Baloch separatists have repeatedly attacked the Jaffar Express in the last few years. It is commonly used by security personnel, mostly from Punjab and Khyber Pakhtunkhwa provinces. The last major attack on the train took place in November when a suicide bomber detonated himself at the Quetta railway station as it prepared to depart.

ISLAMABAD — Pakistan’s neglected southwestern province of Balochistan has been the scene of a yearslong insurgency, with a dramatic uptick in attacks in recent years underscoring the struggles the government in Islamabad faces in dealing with myriad security threats.