One American citizen was killed and another wounded late Sunday when an Afghan gunman opened fire in the building that is believed to be the CIA’s Kabul headquarters. According to The Wall Street Journal, the man “had the trust” of the CIA and may have been an informant. He may also have accessed the roof of the CIA building and fired on the U.S. Embassy before being killed himself. Following the shooting, CIA guards opened fire on an Afghan National Army vehicle, thinking it had attacked them. On Sept. 14, there was a 19-hour siege at the Kabul embassy; U.S. officials have blamed the Pakistani-affiliated Haqqani network for that attack.