Nasir Mehmood, a sergeant in Pakistan's army tells us. Nasir and I are in the city of Quetta, sitting in the waiting room of the largest military hospital in the province of Balochistan. His 14-year-old son Mohammad Ahmad told him he was flung across the army school bus in a bombing in Khuzdar, a few hours' drive away. The bus was carrying around 40 schoolchildren when it exploded at about 07:40 local time (02:40 GMT) on Wednesday.

"I reached the hospital, and there were screams of children everywhere, it was the only thing you could hear," Nasir said. "My eyes just kept searching for my son." Only the most serious cases were airlifted to the Combined Military Hospital. The military have said the death toll has now risen to eight, with six children killed and dozens injured. No group has admitted carrying out the attack. It is rare for foreign journalists to be allowed to enter the province, south-west of Pakistan, let alone a hospital on the army's compound. The military said they wanted international media to witness the impact of the attack themselves.

Pakistan alleges India is linked to the attack, though there is no independent evidence - and it is a claim Delhi firmly denies. India and Pakistan are in the midst of a fragile ceasefire, after a two-week conflict that was their most significant one in decades. It saw them exchange drone attacks, missiles and artillery fire, and left dozens of casualties. (BBC)