Pakistani officials say the suspected mastermind of the plot uncovered in London last week to blow up U.S.-bound airplanes is hiding in a mountainous region of northeastern Afghanistan.
The officials said Friday they told the U.S. military that the suspect, an al-Qaida operative, is believed to be in Afghanistan's Kunar province, which borders Pakistan. They have not disclosed his name.
They say the information was obtained by interrogators questioning British suspect Rashid Rauf, who was arrested in eastern Pakistan and is regarded as a key figure in the foiled plot.
Twenty-three people are in detention in Britain, and Pakistan is holding seven suspects in the plot.
Some information for this report was provided by AFP and AP.