At least four people were killed and 23 people were wounded in a series of explosions in a northern Iraqi city, security officials said.

The six blasts went off in Kirkuk in quick succession after the meal that breaks daylong fasting during the Muslim holy month of Ramadan, when streets are typically crowded with shoppers and people out having dinner.

The blasts struck in the center of the city in a commercial area that has several malls, cafes and restaurants, sending people running in panic.

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Kirkuk is an oil city disputed by Irbil-based Kurdish regional government and Baghdad.

The nature of the blasts was not immediately clear, but officials said they appeared to be improvised explosive devices.

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Iraq declared victory against the Islamic State terror network in 2017, but the group has continued to carry out attacks through sleeper cells, particularly in the country’s north.

There was no immediate responsibility claim, but the head of Kirkuk security operations Saad Harbya, speaking on the Kurdish Rudaw TV, blamed ISIS. The group has claimed several attacks recently around the city, some of them targeting security forces.

The Associated Press contributed to this report.