Starting in 2018, al-Hashimi focused his research on the rise of the Popular Mobilization Forces, a collection of over 150,000 armed members of around 40 different Shi’a militias, who helped the Iraqi government defeat the Islamic State in 2017. The Iranian-supported PMF proved instrumental in reclaiming territory taken by ISIS. However, it has since refused to acknowledge the authority of the central government in Baghdad and retains its weaponry and power.

In recent years, Al-Hashimi emerged as a vocal critic of the PMF and made regular appearances on Iraqi television to discuss the group, its tactics and goals. He taught courses on counterterrorism and advised the Iraqi government, as well as several foreign diplomats and journalists. In recent months, al-Hashimi had reportedly told relatives and friends that he believed the Shi’a militias were “out to get him”, and expressed fears for his life. He had contemplated leaving Baghdad and moving to Kurdish-controlled northern Iraq.

According to news reports, al-Hashimi was shot dead by two gunmen on a motorcycle, as he was leaving his home in north Baghdad. According to eye-witnesses, the gunmen shot al-Hashimi five times before leaving the scene of the crime. The terrorism expert was taken to a nearby hospital, where he was pronounced dead two hours later.

In a statement, Iraq’s newly installed Prime Minister, Mustafa al-Kadhimi, said his administration wound be launching a nationwide manhunt to find al-Hashimi’s killers. However, Monday’s assassination is widely seen as yet another sign that the Iraqi government is unable to control the PMF, and especially its most powerful wing, the Kita’ib Hezbollah (KH). Many were surprised late last month, when Iraqi counterterrorism forces moved to arrest 14 KH members for the first time since the group’s founding. However, all but one of those arrested were released in less than a week, with many accusing al-Kadhimi’s government of backing down out of fear or suffering repercussions by the militias.