A suicide bomber blew himself up on Sunday in a mostly Shiite area of Baghdad, killing at least 10 people, police said of the latest in a series of attacks targeting Iraq's Shiite community.
The attack took place in a crowded square in Baghdad's northern district of Kadhimiyah, leaving 30 people injured.
Security forces cordoned off the area for fear of further attacks, witnesses said.
The Amaq News Agency, affiliated to the Islamic State extremist group, claimed that the attacker detonated his vest amid a crowd of Iraqi army personnel and members of an allied Shiite militia.
The report could not be verified by dpa.
Similar attacks targeting security forces and Shiites in Iraq have been claimed by Islamic State. The radical Sunni group regards Shiites as heretics.
Early this month, 292 people were killed when a car bomb went off in a busy commercial area in central Baghdad.
That bombing - also claimed by Islamic State - marked the deadliest such attack in Iraq since the 2003 US-led invasion, and drew public criticism over the government's alleged inefficient security.
The interior minister resigned in the wake of the attack.
In recent months, Islamic State has suffered major military setbacks and lost ground in Iraq under pressure from a US-backed military campaign aimed at dislodging the al-Qaeda splinter group's foothold in the country.