Pakistani officials say up to nine al-Qaida-linked militants have been arrested in several raids in the southern city of Karachi.
Two Pakistani intelligence officials said those arrested in the Wednesday night raids included Ameer Muawiya -- a man they said was in charge of foreign al-Qaida militants operating in Pakistan's tribal regions near Afghanistan.
The officials said Thursday that U.S. communication intercepts played an important part in tracking down the suspects.
The two officials were speaking on condition of anonymity because they were not authorized to speak to the media.
The raids follow a number of arrests of senior Afghan Taliban figures in Pakistan this month, including the group's No. 2 leader Mullah Abdul Ghani Baradar.
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