The story: A massive explosion at a base used by Iraqi security forces, including the Popular Mobilization Units (PMU), has raised questions over culpability. The blast has particularly grabbed attention as it follows the unprecedented direct exchange of fire between Iran and Israel. While PMU representatives initially blamed the US for the incident, a subsequent retraction has led to speculations about the true nature of the blast. 

The coverage: Shortly after the explosion, which took place early on Apr. 20, images began circulating on social media showing a large fire at Kalsu military base. The site is located around 50 km (31 miles) south of Baghdad...