Militants threatening to kill three U.N. hostages said Saturday that talks with Afghan and U.N. officials had been postponed for another day.

President-elect Hamid Karzai renewed his condemnation of the abduction and received a promise from visiting Pakistani President Pervez Musharraf of closer cooperation in combating terrorism.

"We will do our best to solve this issue and to bring back the hostages to their families as soon as possible," Karzai said.

The abduction of Annetta Flanigan of Northern Ireland, Angelito Nayan of the Philippines and Shqipe Habibi of Kosovo was the first of foreigners in Kabul since the Taliban was ousted in 2001.

The militants released a videotape of the hostages last Sunday, fueling concern that they are copying the tactics of Iraqi hostage-takers. Still, Afghan officials said they suspect the little-known group had help from militias or criminal gangs.

Musharraf pledged a common fight against terrorists, including better sharing of intelligence.

Still, Musharraf did not mention the hostage crisis directly. His relations with Karzai have been strained by suspicions that Taliban rebels find sanctuary in Pakistan.

Authorities have not confirmed any contact with Jaish-e-Muslimeen, the Taliban splinter group purportedly holding the U.N. employees. The group has demanded a U.N. pullout from Afghanistan and the release of Taliban prisoners.