The attack, which occurred just blocks from Karzai's office, shows the parties have a long way to go to reach a political settlement as the Obama administration weighs a major withdrawal of its forces. The White House neither directly confirmed or denied Karzai's statement.

Three men wearing camouflage fatigues that are frequently worn by Afghan soldiers stormed a police station near the presidential palace, with one of them detonating an explosives vest just outside the gates as two others rushed inside and began firing, an Interior Ministry statement said.

The crackle of gunfire echoed through the usually bustling streets for about two hours before security forces killed the two remaining attackers. Insurgents killed three police officers, one intelligence agent and five civilians in the attack, according to the ministry statement.

Taliban spokesman Zabiullah Mujahid claimed responsibility for the attack in a text message to The Associated Press.