Iraq has hanged three people convicted of involvement in a vehicle bombing in Baghdad that killed more than 300 people and injured hundreds in 2016.

While Prime Minister Mohammed Shia al-Sudani’s office did not name those executed or say when they had been sentenced, it did confirm that the executions were carried out on Sunday and Monday, although there are speculations that Ghazwan al-Zawbaee, held to be the IS mastermind behind the attack, was among those put to death.

The Islamic State group (IS) said it had carried out the attack.

It was the deadliest single bombing in Iraq since the US-led invasion in 2003.