Pakistan is to review its relationship with the United States, the prime minister's office said on Sunday, following the killing of the Pakistani Taliban leader in a U.S. drone strike.
But a top-level meeting to examine relations, scheduled for Sunday, was postponed at the last minute without explanation.
Mehsud, who had a $5 million U.S. bounty on his head, was killed on Friday in the northwestern Pakistani militant stronghold of North Waziristan, near the Afghan border.
The Pakistani Taliban have killed thousands of Pakistani civilians and members of the security forces in their bid to impose Islamist rule, but the new government has been calling for peace talks.
The government denounced Mehsud's killing as a U.S. bid to derail the talks and summoned the U.S. ambassador on Saturday to complain.
Prime Minister Nawaz Sharif's office had said he would chair a meeting on the consequences for ties with Washington. There was no indication when it might now take place.
Some politicians have demanded that U.S. military supply lines into Afghanistan be blocked in response.
So let's get this clear - we put a hole in a guy who was wanted for killing people in at least 2 countries, who was hiding in a part of your country where you are powerless to do jack-all about it, and with whom you're trying to cut some sort of treaty so they'll quit killing people, and it's our problem he's dead?
You're welcome, bitches.