Armed extremists killed dozens of people in northeastern Nigeria this week, striking a construction site and a nearby military installation, officials said Saturday.
At least 25 construction workers were ambushed and killed on Thursday in Sabon Gari, a troubled town in Borno State.
A senior police officer said the attack bore the familiar signature of Boko Haram, which fiercely opposes development projects across the region.
Authorities declined to publicly confirm exact figures, citing security concerns that often shroud reporting after militant attacks in Nigeria.
Boko Haram began its violent campaign in 2009, rejecting Western education and seeking to impose its harsh interpretation of Islamic law.
The insurgency later fractured, spawning the Islamic State West Africa Province, which intensified violence across Nigeria and neighbouring countries.
The United Nations says the conflict has killed about 35,000 civilians and forced more than two million people from their homes.
Abdurrahman Buni of the Civilian Joint Task Force confirmed the deaths of the construction workers targeted in Thursday’s ambush.
Hours earlier, extremist fighters also attacked a nearby army base, using heavy weapons and armed drones, security sources said.
Nine soldiers and two civilian task force members were killed, while at least 16 wounded personnel were evacuated for treatment.
Officials said it remains unclear whether Boko Haram or its rival ISWAP carried out the military assault.
Nigeria now faces a layered security crisis, blending insurgency with rampant kidnappings by armed gangs across northern regions.
Last month, the United States launched airstrikes against Islamic State fighters in northern Nigeria, deepening international attention on the conflict.