KABUL — Shortly after security forces gunned down the last assailant involved in a brazen attack in Kabul Wednesday morning, officials said they believe the attackers were dressed as women to smuggle a huge stockpile of weapons into a building overlooking the U.S. Embassy and the NATO headquarters.

The last of six assailants who launched rockets and sprayed the heavily secured compound with rifles for hours was gunned down at 8:30 a.m., police spokesman Sediq Sediqqi said. The attack, which exposed the vulnerability of the Afghan capital as U.S. forces begin to withdraw, began at 1:30 p.m. Tuesday and involved at least three suicide bombers who detonated explosives elsewhere in the city. -- Washington Post