Pakistan on Tuesday expressed concern over the US operation that killed Osama bin Laden near its capital, saying such "unauthorised unilateral" action could threaten international peace.
The foreign ministry denied that Pakistan's civilian or military leadership had any prior knowledge of the operation and said there was no question of US helicopters taking off from Pakistani bases.
"Pakistan expresses its deep concerns and reservations on the manner in which the government of the United States carried out this operation without prior information or authorisation from the government of Pakistan," it said.
It said such "unauthorised unilateral action" cannot be taken as a rule and said it should not become "a future precedent for any state, including the US".
"Such actions undermine cooperation and may also sometimes constitute threat to international peace and security," it added.