At least 16 militants have been killed and 100 passengers were freed as of Wednesday morning, local media reported. The BBC has not been able to independently verify those figures. Among those released are 17 injured passengers, who have been admitted to hospital for treatment.

Pakistani officials say insurgents who attacked a passenger train carrying 440 people in the southwest killed 21 hostages but security forces rescued the others.

Mehboob Hussain was riding the train home on Tuesday when the tracks under the front car exploded. In the depths of central Pakistan's Bolan Pass, a pocket of wilderness so remote that there is no internet or mobile network coverage,