Attacks targeting security forces are increasing in frequency and lethality in Pakistan’s southwestern province of Balochistan, where a separatist militant group has adopted new tactics.

A dramatic escalation in the tactics by a Baloch separatist group came with the hijacking of a passenger train on Tuesday.

The train hijacking in south-western Pakistan represents a major escalation in the region’s long-running insurgency.

A “complex operation” is ongoing in Pakistan’s southwestern province of Balochistan, according to a security source, after a ...