Kabul ( CNN ) -- A suicide bomber dressed as a security guard blew himself up Wednesday in a street near the U.S. Embassy in the Afghan capital , killing himself and two other people , authorities said . The attacker set off the explosives attached to his body around 8 a.m. after he was noticed by security guards in the neighborhood , said Sediq Seddiqi , a spokesman for the Afghan interior ministry . The blast took place in a district that houses international organizations , diplomats and senior government officials . Afghan authorities do n't know what the bomber 's intended target was , Seddiqi said . One of the people killed was a security guard and another was a civilian , Seddiqi said . One person was wounded in the attack , he said . Violent attacks are frequent across the country , where Afghan and NATO troops are battling an insurgency led by the Taliban . Kabul , where the Afghan government is based and many foreign organizations have heavily guarded headquarters , has n't been spared from the unrest . In September , a suicide bomber killed six people and wounded four others near the headquarters of the NATO-led International Security Assistance Force ( ISAF ) . And in April , Afghan security forces said they repulsed a wave of insurgent attacks in the capital and three other provinces . Buildings that came under attack included the Afghan Parliament and the American , German and Russian embassies .
The explosion occurred in a district of international organizations . One security guard and one civilian are killed by the suicide bomber , who also died . Violent attacks are frequent across Afghanistan , including Kabul .