Pakistan’s prime minister traveled to restive southwestern Balochistan province Thursday to meet survivors of a train attack and the commandos who rescued over 300 passengers from the insurgents who killed 21 civilians and four troops.

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.

A security force personnel member stands guard near a train containing empty coffins that are dispatched to Bolan where a passenger train that was attacked by separatist militants, at a railway station in Quetta,