The cause of the Sadr City blast was not immediately known.
Five Iraqi families have brought a lawsuit in France against Prime Minister Adel Abdul Mahdi, alleging that he was responsible for the killing and injury of protesters in 2019.
The Polisario Front said its police chief was killed in the disputed Western Sahara region.
Despite Jews having lived in Iraq for around 2,600 years, only four remain in the country after the passing of Dhafer Eliyahu.
In the days following Pope Francis' visit, two high profile abductions and killings of activists and dissidents' family members brought Iraq's perennial problems with militia violence roaring back into focus.
Pro-independence rebels fighting Morocco for Western Sahara said the United Nations was responsible for "political deadlock" over the disputed territory, on the 45th anniversary of their unilateral declaration of independence.
Three protesters are said to have been killed and 73 injured in heavy clashes with security forces in Iraq's southern city of Nasiriyah.
In-depth: With elections on the horizon, activists and mainstream parties have been discussing possible alliances. But many in Iraq's protest movement fear they will be silenced.
Prime Minister Mustafa Al-Kadhimi negotiated an agreement with Iran to stop missile attacks targeting the US embassy in Baghdad, intelligence sources say.
Iraqi cleric Moqtada Sadr has backed a call for early elections as his movement aims to take the post of prime minister