Baghdad, Iraq (CNN) -- Insurgents with ties to al Qaeda attacked a checkpoint in western Baghdad and killed five police officers early Tuesday, officials said.
The gunmen, who police officials said used pistols equipped with silencers, left behind a black flag used to represent the Islamic State of Iraq. The umbrella group includes a number of Sunni extremist organizations and has ties to al Qaeda in Iraq.
The same flag was left behind by insurgents after they attacked several security checkpoints and killed at least 16 people in a neighborhood in northeastern Baghdad last week.
The Islamic State of Iraq also claimed responsibility for last week's suicide attack on a television station in Iraq that killed at least six people and wounded 20 others.
Police officials said another officer was wounded Tuesday after a bomb attached to his vehicle exploded in the Hurriya district in northwestern Baghdad. Two bystanders were also injured, police said.
CNN
