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.
A UN helicopter pilot was severely injured.
The Nigerian army has confirmed the incident – a statement said 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.
The Nigerian army says a “detailed investigation” into the “highly regrettable incident” has commenced.
For more than a decade now, Nigerian troops have been fighting an Islamist insurgency in the north-east of the country.
