At least 60 people are believed to have been killed in twin attacks in Borno state. Armed militants also attacked a UN humanitarian hub with rocket launchers, reportedly accusing them of being "non-believers."
Jihadists connected to the Islamic State West Africa Province (ISWAP) militant group killed at least 20 soldiers and 40 civilians over the weekend in twin attacks in the restive northeast Nigerian state of Borno, residents and security sources said.
Inhabitants of remote Goni Usmanti village told French news agency AFP that jihadists linked to IS shot 38 people in a raid on Saturday and set a truck ablaze killing an unknown number of passengers.
Dozens of militants clashed with soldiers and members of a government-backed militia in Monguno near Lake Chad and in Nganzai, just days after militants killed at least 69 people in a village raid in Gubio. ISWAP claimed the two Saturday attacks, and the Gubio attack.
Militants armed with heavy weaponry and rocket launchers arrived in the humanitarian organization's hub of Monguno on Saturday, clashing with government forces and killing at least 20 soldiers.
"They fired rocket-propelled grenades indiscriminately which fell on homes, killing three people and injuring many others," resident Kulo Gana told French news agency AFP. "I saw the bodies of the two soldiers and the militia member on the streets after the fighting."
The Nigerian military wrote on Twitter Sunday that the army and air force had "successfully repelled" the attack on Monguno and killed 20 jihadists.
Attack on 'non-believers'
According to humanitarian workers and local residents in the area, hundreds of civilians were injured in the crossfire. The local hospital reportedly became overwhelmed with the number of victims, forcing some of the injured to lay outside the clinic awaiting help.
Local sources told Reuters news agency that the militants also set fire to the local police station and burned down the United Nations' humanitarian facility in the area, although a UN spokesperson said the establishment sustained only light damage.
According to Reuters, militants distributed letters to residents, warning them not to work with the military, white Christian westerners or other "non-believers."
Twin attacks
Militants also raided Nganzai at about the same time on Saturday, according to two residents and one Civilian Joint Task Force (CJTF) fighter. They arrived on motorcycles and pickup trucks and killed more than 40 residents, the sources said.
In the region's 10-year-long conflict, ISWAP and rival jihadist group Boko Haram have killed 36,000 people and displaced around two million from their homes, according to the UN.
The conflict has spilled over into neighboring Niger, Chad and Cameroon, prompting a regional military coalition to fight the militants.