The Wall Street Journal reports:

An Afghan gunman late Sunday killed one American citizen and wounded another at what is reported to be the Central Intelligence Agency’s offices in Kabul.

The two American citizens came under fire by a “lone Afghan employee” in an “annex of the U.S. Embassy” in Kabul, said Embassy spokesman Gavin Sundwall. Mr. Sundwall wouldn’t comment on whether the shootout involved CIA employees or occurred at the CIA’s Kabul offices.

A western security official in Kabul said the Afghan attacker “had the trust” of the CIA employees in the compound, and was possibly an informant, which is why he was allowed into the annex and had access to a gun. It wasn’t clear if he was searched before entering the building.

The western security official said the gunman late Sunday may have gotten on the roof of the CIA building, where he fired on the nearby U.S. Embassy.

Sunday night’s attack comes less than two weeks after Afghan insurgents occupied a building under construction and fired rocket-propelled grenades at the U.S. Embassy. About a half-dozen rockets penetrated the Embassy’s fortified walls and several more hit within the U.S.-led military coalition’s headquarters in Kabul. The attack lasted for about 20 hours.