At least 20 civilians were killed in a military air raid in northwestern Nigeria on Monday.
The attack occurred as a local militia group went on the offensive against a criminal gang that had stolen livestock and kidnapped a large group of people.
When the Nigerian military arrived to provide assistance, they mistakenly identified the militia as part of the criminal group and attacked the civilians by mistake.
The latest attack is one in a series of incidents that have occurred in connection with the country's struggles against different armed groups, ranging from Islamist extremists to criminal gangs.
The criminal gangs in Nigeria's northwestern parts are driven primarily by economic gain, unlike the extremist groups' terrorist operations in the northeastern parts.
