A suicide car bomb exploded Saturday outside the main gate of NATO's headquarters, killing seven and wounding 91 in the biggest attack in the Afghan capital in six months, The Associated Press reported. The bomber evaded several rings of Afghan police and detonated his explosives on the doorstep of the international military headquarters. The explosion was the first major attack in Kabul since February, when eight militants struck three government buildings simultaneously in the heart of the city, an assault that killed 20 people and the eight assailants.