Two explosions killed at least 10 people at a crowded market in the northern Nigerian city of Maiduguri on Monday, witnesses and sources said.

The first attack was carried out by a female suicide bomber with firewood concealing explosives, a witness said. A second device hidden a few metres away exploded around five minutes later, said a military source.

No group claimed responsibility for the attacks, but they bore the hallmarks of militant Islamist group Boko Haram, which has killed thousands of people in a six-year insurgency in the northeast of Africa’s most populous nation and top oil exporter.

“The woman was carrying a bowl with firewood inside and suddenly, the bomb went off,” witness Ali Bukar said. He said the woman and five others were killed.

A source at State Specialist Hospital Maiduguri said the death toll was 11, and 60 injured were admitted for treatment. A Reuters witness at the hospital counted 10 dead bodies.

Boko Haram, which wants to set up an Islamic caliphate in northeastern Nigeria, has killed around 100 people in Maiduguri in the past month.

Reuters