Explosives tied to a motorcycle blew up in the southern city of Basra in Iraq on Tuesday, killing four people and injuring four others, according to Iraqi officials. The explosion caused two other vehicles to catch fire.

Asaad al Eidani, the governor of Basra, blamed the Islamic State for the explosion. No group has publicly claimed responsibility as of Tuesday.

“Daesh is trying to destabilize security in Basra, but it will not be successful,” al Eidani said, according to the Associated Press. Daesh is the Arabic acronym for the Islamic State.

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Iraq’s Security Media Cell, a security outlet in Iraq, told the news outlet that the four injuries resulted from the fire that spread to the two vehicles. A forensic team is investigating the blast, and more information will be released upon completion of the investigation.

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The explosion, which occurred near a hospital, is a rare occurrence in Basra since the defeat of the Islamic State in 2017 with the help of a United States-led coalition. However, Islamic State militants still attack the northern region of Iraq, including an attack Thursday that left 12 people dead.