A key outlawed Pakistani militant group behind numerous gun and bomb attacks has announced a three-day ceasefire ahead of Eid al-Fitr, hours after Pakistan and Afghanistan also declared a temporary halt to escalating fighting.

Pakistan and Afghanistan on Wednesday declared a temporary pause in escalating fighting, two days after Kabul blamed Islamabad for a deadly airstrike in the Afghan capital that it said killed hundreds of people at a drug rehabilitation hospital.

Pakistan and Afghanistan have agreed to temporarily suspend fighting during the Muslim holiday of Eid al-Fitr, both countries announced days after dozens were killed at a Kabul drug rehabilitation hospital.