About 10 Chadian soldiers died in fighting to take control of two towns in northern Nigeria from Boko Haram, the first gains against the militants in a joint offensive launched with Niger at the weekend, military sources said yesterday.

About 30 Nigerian and Chadian soldiers were wounded in the clashes over Malam Fatouri and Damasak, a day after thousands of troops crossed the border to seize areas held by the Sunni Islamist group, whose insurgency has forced Nigeria to delay an election and neighbours to mobilise their armies. A Chadian officer, who asked not to be named, said about 10 Chadian soldiers were killed and 20 wounded in fighting for the towns. There was no official comment from Chad’s army.

“We have kicked the enemy out of these areas and they are now under our control,” a Niger military source said.

The advancing troops had seized large quantities of arms and ammunition as well as vehicles, he said, and were undertaking a clean-up operation in the area. “The troops have taken dozens of Boko Haram elements prisoner,” he added.

Damasak, the town furthest into Nigeria, is 10 km south of the Niger border, where Nigerian and Chadian troops had been massing in recent weeks before the offensive.

A medical source in Diffa, the capital of the Niger region which borders Boko Haram’s heart-land in northeastern Nigeria, said 30 wounded soldiers had been admitted to the town’s hospital.

A second Niger military source said about 300 Boko Haram militants had been killed. There was no official confirmation of the toll and it was not possible to verify the figure.

“We had permission from Nigeria for this action,” the source said.

There was no immediate comment from Nigeria, which has launched its own offensive against the militants. Their gains forced Nigeria to delay elections that were due in February.

“I can’t tell you if there were deaths within our ranks. If there were, the families would be informed first,” the second Niger military officer added.

Boko Haram’s six-year insurgency, which aims to carve out a caliphate in Nigeria’s northeast, has killed thousands. The group has pledged allegiance to Islamic State, which rules a self-declared caliphate in parts of Iraq and Syria, according to an audio clip posted online on Saturday.

Cameroon, Chad, Niger and Benin have mobilised forces this year to help Nigeria defeat the group after it seized large amounts of territory and staged cross-border attacks.

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