A Pakistani man was detained at the U.S. Embassy in Chile yesterday after field tests detected explosive residue on his hands and personal items, the State Department said today. A U.S. official tells ABC News the man had been recently added to a U.S. terror watch list, and as a result his U.S. visa was in the process of being revoked. In accordance with U.S. law, the man had been notified of the intention to revoke his U.S. visa and he was at the embassy to discuss the matter.