KABUL, Afghanistan - Officials now say at least 12 people have been killed in a suicide bombing in the Afghan capital.
A car packed with explosives slammed into a mini-bus carrying foreign aviation workers to the airport in Kabul.
Officials say eight of the dead were South Africans believed to have been working for an aviation company based in Johannesburg.
Four Afghans were also killed and another 11 Afghan civilians were wounded.
A militant group headed by a onetime U.S. ally claims it carried out the attack to avenge an American-made film that ridicules the Prophet Muhammad.
It says the suicide bomber was a 22-year-old woman.
A spokesman for the group Hizb-i-Islami warned of more attacks against foreigners working for NATO.
The blast was the first to target Kabul since a video clip of the film was posted on the Internet last week, sparking angry protests across the Muslim world.
It was the second, and deadliest, attack in Afghanistan that militants have said they carried out as revenge strikes in response to the film.