Conflicting reports have emerged of the toll from Thursday’s drone strike on an Islamic school in Pakistan. Anonymous officials say the dead were five members of the Taliban-linked Haqqani network. But Pakistani opposition leader Imran Khan said the attack killed civilians, including children.

Imran Khan: “Four children have been killed. We will release their names. We will even get the pictures.”

Reporter: “But they were students?”

Imran Khan: “Students, we don’t know as yet. Four children have been killed, and two teachers have been killed in this. And there have been several people wounded badly. We want a clear — a clear pronouncement by the American government that there will not be any more drone attacks in Pakistan.”

Khan has vowed to block NATO supply routes until the U.S. pledges to halt drone attacks. The strike in the district of Hangu was believed to be the first outside of Pakistan’s tribal regions.