Two policemen were shot dead and their bodies set ablaze at a Baghdad checkpoint on Saturday while three of their colleagues and an anti-Qaeda fighter were also killed, security officials said. Insurgents shot the two policemen as they sat in their car in eastern Baghdad, the capital's security leaders said, and then set it on fire, while three others were killed by silenced pistols at a checkpoint in the west of the city. Baghdad Operations Command blamed the attacks on negligence on the part of local forces, and said unit commanders would have to explain their mistakes, but did not give details on possible disciplinary measures to be taken.