Baghdad: A car bomb exploded in a parking lot on the perimeter of Baghdad’s heavily guarded international airport complex on Sunday, wounding five people, security sources said.

The blast occurred at the first point where passengers gather to be searched before boarding airport taxis to the terminal building, which is several kilometres away, the sources said.

It was not immediately clear who was responsible for the attack.

Iraq is facing its worst crisis since a US-led invasion toppled Saddam Hussain in 2003.

Daesh militants who swept through the north of the country in June and hold large parts of western Iraq have claimed responsibility for suicide bombings in Baghdad and elsewhere.

The presence of the Sunni insurgents has fueled sectarian tensions, deepening a security crisis and drawing US air strikes after Western hostages were beheaded.

The air campaign, which includes neighbouring Syria, has helped prevent any further Daesh advances in recent weeks.

The United States’ top military officer told American troops on a surprise visit to Baghdad on Saturday that the momentum in the battle with Islamic State was “starting to turn”, but predicted a drawn-out campaign lasting several years.