Militants killed an Afghan national over alleged charges of spying for the US here on Monday. According to details, the bullet riddled body of a person stated to be an Afghan national was recovered from Rustam Bazaar, Wana, the tribal headquarters of South Waziristan Agency (SWA). A written letter was also found with the body stating that the said person was killed over spying for US forces and a warning that those found guilty of any such charges would have to face the same fate.