The attack occurred before noon when a suicide bomber drove a military Humvee packed with explosives into a military base at an abandoned huge plant, known as al-Muthanna, north of the Islamic State (IS)-held city of Fallujah, some 50 km west of Iraqi capital of Baghdad. The powerful blast destroyed an ammunition depot and some of the plant's buildings, which house dozens of Iraqi federal police and Shiite militias. The latest violence in Anbar came six days after Iraqi security forces and allied militias commenced a military offensive aimed at driving out IS militants from Ramadi, which the extremist militants took full control on May 17.