Twin suicide bomb attacks in the capital of Cameroon’s far northern region Maroua killed at least 13 people on Wednesday, senior Cameroon military sources told Reuters.

Cameroonian Police confirmed that death toll have risen to 20 people with dozens sustaining different degrees of injury.

The attack was the second this month and was the furthest south that Cameroon has been struck since it deployed thousands of troops to the region to combat neighboring Nigeria’s Boko Haram insurgents.

A senior military source said the first explosion hit a market, while the second one hit a densely populated neighborhood.

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