Shocked Iraqis react moments after a roadside blast targeting a police patrol on the third anniversary of the US-led invasion.
More police and the emergency services arrived shortly afterwards. Reports put the death toll at two police and two civilian bystanders.
The bombers, suspected insurgents, hit one of the main roads in the middle-class Karrada district in southern Baghdad.
Local police officers came to investigate the attack, taking statements from witnesses.
The damaged police vehicle was taken away from the scene of the attack by a civilian tow truck.
Such attacks have become a regular feature of life in Iraq since the US-led overthrow of Saddam Hussein's government in 2003.
Vehicles like the one attacked, carrying Iraqi police commandos, are a common sight in the capital - often accompanying US convoys that are much better protected.
A little later the only reminder of the fatal bomb attack is the leaked fuel from the vehicle and pools of victims' blood.