WASHINGTON — Two men have been convicted of first-degree murder in the fatal shooting of a District of Columbia gang leader.

William Foster was slain in April 2008 as he sat in his van while stuck in rush-hour traffic. Federal prosecutors say Foster was the leader of a gang called the Todd Place Crew, and his slaying resulted in a series of gang shootings between Foster’s gang and a rival crew.

Twenty-six-year-old Deon Jenkins and 20-year-old Deandre Rogers, both of Washington, were convicted Friday in Foster’s death. A third defendant, Austin Hall, was acquitted.

Prosecutors say Jenkins was the leader of a rival gang and dispatched Rogers, a junior member, to shoot Foster as he sat in his car. Prosecutors say Rogers fired a dozen shots at point-blank range.