(VOI) -- Joint U.S.-Iraqi forces arrested the leader of a gang specialized in kidnapping and killing citizens after armed clashes, during which he was injured, a police source said on Monday. "A joint force of U.S. and Iraqi personnel arrested the leader of an armed group accused of kidnapping, looting and killing innocent civilians in the city of Kut after receiving intelligence information," the source, who asked for anonymity, told Aswat al-Iraq - Voices of Iraq - (VOI). "Armed clashes erupted while arresting the leader, during which he was injured in his leg and was sent to a hospital for treatment," he added. "He is now under investigation," he also said.