A helicopter gunship raid on a madrassa on Pakistan's border with Afghanistan has left at least 80 dead. The attack happened in tribal area of Bajaur.
The Pakistani military said the religious school was being used as a training camp for militants.
Pakistan has deployed thousands of troops along the country's rugged border with Afghanistan to hunt the militants hiding there since the ousting of the Taleban in 2001.
But an eyewitness told the BBC the madrassa school was filled with local students who had resumed studies after the Muslim Eid holidays.
Cabinet minister Siraj ul-Haq, from Pakistan's North West Frontier Province, condemned the attack and said he would resign in protest.
The attack came just days after local militants attended a rally in the area where they declared the al-Qaeda leader Osama Bin Laden a hero.
In Lahore, Pakistani students from a religious group took part in a rally to condemn the attack on Bajaur.