At least 38 people were killed by a suicide bombing on Monday at a funeral northeast of the Iraqi capital, security officials said.
Dozens of people were wounded in the bombing in Muqdadiyah.
Among the killed included a local commander in Asaib ahl al-Haq, a powerful Shiite militia that is part of the state-sanctioned Popular Mobilization Forces, which is in charge of security in the area.
An anonymous source from the Business Insider stated that the suicide bomber was wearing an explosive vest and detonated himself at a funeral tent in the Shiite village.
The Islamic State group has claimed responsibility for Monday's attack in a statement posted online.
A twin suicide bombing claimed by the Islamic State, also known as ISIS, killed 70 people just the day before in Shi'ite on Sunday, recording the deadliest attack inside the capital this year.
The initial attack on Sunday was in a crowded market where a suicide bomber targeted a crowd that was gathered to help the victims.
112 people remain hospitalized, according to police officials. Many of the officials have agreed to speak on condition of anonymity because they have not been authorized to speak to the media.
According to a United Nations report, over 22,300 people have been estimated to either being killed or injured in armed conflict in Iraq during 2015.
