In a village near the Nigerian capital Maiduguri, alleged Boko Haram fighters have attacked a funeral in the northeastern state of Borno and killed at least 50 people Saturday, eyewitnesses say.
The death toll could reach 65, according to news agency AFP.
Attacks by Boko Haram and other Islamist groups in Nigeria and throughout the region have increased.
Tens of thousands of civilians have been killed and more than two million displaced during the last decade of the conflict.
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Boko Haram, loosely translated, means "Western education is prohibited" and promotes a version of Islam that prohibits Muslims from engaging in political or social activities related to the West. The group is fighting against the overthrow of the government and the creation of an Islamic state.
She was active not only in Nigeria, but also in the neighboring countries Chad, Niger and Cameroon.
Boko Haram is notorious for kidnapping schoolchildren, and garnered worldwide media attention in 2014 after nearly 300 girls from a school in Chibok town, Borno, the state where the militant group was most active, had been abducted.
In 2015, it was classified as the world's deadliest terrorist attack group by the Institute for Economic and Peace.
The territory controlled by the group has declined in recent years and has shattered into rival factions.
However, militant Islamists remain active in the region defying attempts by the army to end the uprising.