The death toll from a militant hijacking of a train in Pakistan's southwestern mountains has risen to 31 soldiers, staff and civilians, the military said on Friday as it accused India and Afghanistan of backing the insurgents.

India on Friday dismissed Pakistan's terrorism allegations, stating the world knows the true "epicentre of global terrorism". This came after Islamabad accused India of backing terror but did not directly link it to the Balochistan train attack that killed 21.