An explosion hit a NATO patrol in southern Afghanistan on Tuesday, killing one soldier and wounding another, the alliance said. The troops were patrolling in Ghazni province, NATO's International Security Assistance Force said in a statement. No details were given about the explosion or the troops' nationalities. In the western province of Herat, Taliban attacked a checkpoint Monday in Shindand district, killing two police officers and wounding another, said Rauf Ahmadi, spokesman for the western region police. Authorities say that more than 900 police were killed in insurgent attacks last year. Overall, the U.N. says that more than 8,000 people, mostly militants, were killed in 2007. Also in Shindand, eight people were killed Tuesday morning during a six-hour gunbattle between two tribes, Ahmadi was quoted as saying by the Associated Press.