AlHijjah 4, 1433, Oct 20, 2012, SPA -- An Afghan police officer and cook poisoned their colleagues at a checkpoint in an assault coordinated with insurgent fighters that left six dead in the country's south, officials said Saturday. The police officer and the cook worked with outside insurgents in the assault, which hit police manning a checkpoint in Gereskh district of Helmand province, AP quoted the governor's office as saying in a statement. They poisoned two of the officers and then the militants attacked from outside, killing the remaining four officers, provincial spokesman Ahmad Zirak said. He did not say how the officers were poisoned. The police officer was captured as he fled, but the cook escaped and remains at large, Zirak added. The insurgent gunmen escaped by motorcycle with weapons and ammunition, the governor's statement said.