(CNN) -- A former associate of Osama bin Laden, described by authorities as a "Pakistan-based attack planner," has been arrested in Afghanistan, a spokesman for the NATO-led coalition said Thursday.
The International Security Assistance Force declined to identify the man, saying it was not releasing further information.
"It's part of an ongoing operation," Army Maj. Tim James, spokesman for ISAF's joint command, told CNN by telephone from Afghanistan.
The man was arrested along with two others described as "associates," according to ISAF, during a raid Wednesday in the northern province of Balkh, an insurgent stronghold that borders Uzbekistan.
He was captured during an overnight operation after he was tracked to a compound in Nahr-e Shahi, the statement said.