Bombings in two restive eastern Afghan provinces killed at least 29 people Wednesday, authorities said.

One strike occurred in Khost city when a suicide bomber on a motorcycle targeted NATO and Afghan security forces. The town is in the province of the same name.

The U.S. Embassy in Kabul and Afghan President Hamid Karzai's office said 17 Afghan civilians were killed and 32 others were injured. The embassy said three members of the NATO-led International Security Force and an Afghan interpreter died in Khost. A Western official told CNN the soldiers are Americans.

In Logar province, four children and two women were among eight killed when a vehicle hit a roadside bomb planted by the Taliban, according to a Twitter message from Interior Ministry spokesman Sediq Seddiqi.