Before dawn on Jan. 25, a Philippine National Police commando team crept toward a thatched hut in the marshy jungles of Mindanao. They were hunting Marwan, an elusive bomb maker with a $5-million U.S. bounty on his head.
But they weren't hunting alone.
Five or six U.S. counter-terrorism advisors assisted from a police command post nearby, tracking the assault team in live video from a U.S. surveillance aircraft circling overhead. "Their main role was to provide tactical, live intelligence," said a Philippine officer who was present.
As the 13 commandos closed in, one stepped on a buried mine. The explosion wounded him and brought a burst of gunfire from the...