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The morning shooting occurred amid heavy traffic near Massoud circle, an intersection near the U.S. Embassy and an American military base.

Brig. Gen. Blotz said Wednesday that it remains unclear whether the U.N. vehicle was the intended target of the shooting.

Also Tuesday, a roadside bomb wounded seven civilians in the Arghistan district of Kandahar and another bomb killed two civilians and wounded two others in Khakrez district, the Afghan Ministry of Interior said.

Afghan and international forces are ramping up security in and around Kandahar, the birthplace of the Taliban.

Brig. Gen. Blotz said 43 insurgents were killed or captured in a three-day operation aimed at disrupting insurgents in the Panjwai district of Kandahar province, where they have plotted attacks on Kandahar city. In the past two months, joint forces have reportedly captured more than 115 suspected insurgents, including more than 15 mid- and senior-level militant leaders, and destroyed four roadside mine factories.

Associated Press Writer Amir Shah contributed to this report.