Pakistani intelligence agents are interrogating five detained Americans over possible links to extremists.
U.S. officials believe the five are young men who went missing more than a week ago from their homes in the northern Virginia and Washington, D.C.
Pakistan police say the five men were staying at a house in the eastern city of Sarghoda believed to be used by the Jaish-e-Mohammed militant group. Jaish has alleged links to al-Qaida and has traditionally focused on targets in India, Pakistan's longtime rival.
Two police officials said Thursday the men were cooperating after first giving conflicting statements.
They said investigators seized a laptop computer and extremist literature from the house.
The officials spoke on condition of anonymity because of the subject's sensitivity.