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Officials in southeast Afghanistan say a suicide bomber rammed a car filled with explosives into a foreign military convoy, killing at least one person.
The attack occurred Wednesday in Mandozai district of Khost province, near the Pakistani border. International officials say the blast killed at least one American service member.
Also Wednesday, British officials confirmed that a box of leaflets dropped from a British plane in June killed a local Afghan girl in rural Helmand province.
Defense ministry officials in London said the box failed to open properly and instead struck the girl, fatally wounding her. The ministry expressed deep regret and said it is investigating.
Civilian casualties caused by foreign forces have become a contentious issue in Afghanistan. U.S. and NATO commanders say they have implemented new procedures to try to minimize civilian casualties.
On Tuesday, officials in southern Afghanistan said a passenger bus hit a roadside bomb in Kandahar province, killing 30 civilians and wounding at least 39 others.
No one claimed responsibility for the attack, but the Afghan government blamed Taliban insurgents. The victims included women and children.
An Afghan presidential spokesman, Humayun Hamidzada, expressed deep sadness for the loss of life and said authorities are investigating.
Some information for this report was provided by AP and Reuters.