An Iraqi police source said on Wednesday night the incident took place in Baghdad's Sadr City district, while ammunitions stored near a local mosque were being transferred to a car park.
"An arms depot exploded... The security forces have opened an inquiry to determine the cause," said a military source, Presstv reported.
Earlier, a ministry spokesman described the blast as “a terrorist aggression on civilians.”
On May 16, at least eight people lost their lives and dozens more sustained injuries when a powerful bomb blast ripped through a funeral near the Iraqi capital city of Baghdad.
There was no immediate claim of responsibility for the deadly attack, but such assaults bear the hallmarks of those carried out by remnants of the Takfiri Daesh terrorist group.
On December 9, 2017, Iraq’s Prime Minister Haider al-Abadi declared the end of military operations against the Daesh terrorist group in the Arab country.
Daesh began a terror campaign in Iraq in 2014, overrunning vast swathes in lightning attacks.