A suicide bomber in Kabul launched an attack on NATO vehicles, killing at least six people and wounding 30 in the process, the AP reports. "It was a powerful explosion and some of the dead were badly burnt and cannot be recognized," says an Afghan official. Reports are conflicting, but NATO now says the dead include two coalition service members and four civilian contractors. During the rush-hour attack, the bomber drove a Toyota Corolla into a NATO convoy, police said. A spokesman for Taliban-allied Hizb-e-Islami militants said the group's "target was American advisers." He says 12 Americans were killed, but insurgents commonly overstate such figures, Reuters notes. The group claims it has a dedicated "martyrdom" unit to attack foreign troops.