A key leader of so-called Islamic State (IS) in Iraq's Anbar province has been killed in a US-led coalition air strike, the Pentagon says.

Pentagon spokesman Peter Cook said Abu Waheeb and three others died when their vehicle was hit on 6 May near Rutba.

"It is dangerous to be an Isil leader in Iraq and Syria nowadays," Mr Cook added, using an acronym based on the former name of IS.

Abu Waheeb has falsely been declared dead on several previous occasions.

The Pentagon described Abu Waheeb as the IS "military emir for Anbar province".

Born in 1986 and a former computer science student, Abu Waheeb was often described on monitoring sites as a rising star among IS.

He was arrested by US forces in Iraq and sentenced to death but escaped prison in 2012, the following year gaining notoriety for killing a group of Syrian truck drivers travelling through Iraq.

An international coalition led by the US has been carrying out air strikes on Iraq since 2014, when IS seized large swathes of territory.