Four suicide bombers of the so-called ’Islamic State of Iraq and the Levant’ (ISIL) takfiri group infiltrated into an army headquarters west of Baghdad, killing an Iraqi general and five other soldiers.

Four suicide bombers of the so-called 'Islamic State of Iraq and the Levant' (ISIL) takfiri group infiltrated into an army headquarters west of Baghdad, killing an Iraqi general and five other soldiers, army and police officers said on Tuesday.

The terrorist bombers attacked a regimental headquarters in the Haditha area of Anbar province late on Monday, killing Staff Brigadier General Ali Aboud, Lieutenant Colonel Farhan Ibrahim and four others, the sources said.

Major General Ali Ibrahim Daboun, the head of the Al-Jazeera Operations Command, said one suicide bomber blew himself up inside Aboud's office, while the other three detonated explosives elsewhere inside the headquarters.

Seven soldiers were also wounded in the attack, Daboun said.

Colonel Faruq al-Jughaifi, the Haditha police chief, confirmed the attack, saying it took place near a major dam in the area, and that the bombers were dressed in military uniforms.

ISIL occupied swathes of Iraq, including large parts of Anbar, in a sweeping offensive launched in June 2014, but has largely been on the defensive in the province since the middle of last year.

Iraqi tribesmen and security personnel defending Haditha, which lies near the country's second largest dam, have held off ISIL for more than 18 months.