Mehsud said: "Soon we will launch an attack in Washington that will amaze everyone in the world." He offered few details, though in a separate recorded conversation with a radio station, he said the White House was a target. The attack on Lahore's outskirts on Monday left at least 20 people dead, including seven police, and sparked an eight-hour stand-off with security forces that ended when black-clad commandos stormed the compound. Some of the gunmen blew themselves up.