A joint Afghan-coalition patrol killed two Afghan policemen who opened fire on their team in northeastern Afghanistan, the coalition said in a statement Sunday. The joint patrol was conducting an operation against a senior insurgent leader in Kapisa province late Friday when the Afghan policemen began shooting, despite attempts to identify themselves as friendly forces, the statement said. "In self-defense, the patrol returned fire killing two individuals," it said. The coalition said it was reviewing the incident. "We sincerely regret the loss of life of our friendly forces and we are continually working with our Afghan partners to prevent situations like this from happening in the future," said Col. Greg Julian, the spokesman for the US forces in Afghanistan.