A suicide bomber detonated an explosives-rigged vehicle at a checkpoint near Baghdad on Wednesday, killing at least four people, officials said, an attack claimed by the Islamic State group. The bombing at a checkpoint leading to the Husseiniyah area, north-east of the capital, also wounded 21 people, the officials said. IS issued a statement saying an Iraqi carried out a suicide bombing targeting a checkpoint, but gave the location of the attack as Shaab, an area adjoining Husseiniyah.