At least 31 Islamic State militants were killed in Syrian air force raids Sunday in the northern province of Raqa, a stronghold of the jihadist fighters, a monitoring group said.

"The regime carried out 13 raids on the city of Raqa and 11 on the town of Tabqa in Raqa province, killing at least 31 jihadists and wounding dozens of them," said the Syrian Observatory for Human Rights.

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