A Nigerian soldier has opened fire at a military base in the north-eastern state of Borno, killing a fellow trooper and a humanitarian worker and injuring an UN helicopter pilot.
The Nigerian army has confirmed the incident in a statement, adding that the attacker had been shot dead. It also said the injured pilot was in a stable condition.
The motive for the attack was not immediately clear.
“A detailed investigation into the highly regrettable incident has commenced,” the army statement said.
For more than a decade now, Nigerian troops have been fighting an Islamist insurgency in the north-east of the country.