KABUL—Civilian casualties in Afghanistan are headed toward a record high this year, the United Nations said Monday, as violence in the country worsens 15 years after the U.S.-led invasion.

There were 1,601 civilian deaths and another 3,565 injuries to noncombatants in the first six months of 2016, a 4% increase in casualties over the same period the previous year, the U.N. said in the report released Monday. Almost a third of those killed or wounded were children, it said.

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