A resident of Bara Qadeem, the village where the raid took place, told Reuters that he saw some "goras", a term usually applied to white Westerners, observing the raid.
"They came in a black car with tinted glass, but did not take part in the operation," he said, speaking on condition of anonymity.
The intelligence officials had earlier said that the arrested men were believed to have planned attacks on trucks taking supplies to Western forces in Afghanistan and they included four Arabs and three Afghans. A militant source had said that two Arabs and five Afghans were arrested.
The intelligence officials later said the nationality of the other suspects was being established.
The International Herald Tribune reports that seven militants were arrested and were believed to be planning attacks on NATO convoys using the Khyber Pass to supply troops in Afghanistan. A Pakistani security official said Taifi had been hiding in Bajaur, a tribal district that has seen fierce battles between Pakistani troops and Taliban militants.
Taliban guerrillas have recently increased efforts to attack the route, prompting American officials to secure pacts with Russia and Central Asian nations to transport goods into Afghanistan from the north.
The Associated Press (AP) reports that an unmanned spy plane and three helicopters were overhead during the raid. In recent months, the US has stepped up its use of drones to fire missiles at Al Qaeda leaders and other targets along the Afghan-Pakistani border. Pakistan has objected to the violation of its airspace. Wednesday's raid involved close cooperation with US officials, though none have commented publicly. Pakistan's Army has so far declined to comment.