Pro-Taliban militants beheaded two tribesmen in North Waziristan for allegedly working for American forces, said a security official on Monday.Gunmen captured one of the tribesmen and killed him in Khar Qamar on Sunday, said the official. "They beheaded the man and fled in his vehicle," the official said on condition of anonymity. Residents also found a headless body in Madhakhel, said the official. "All those working as US spies will face the same fate," proclaimed a note found near the body.