A United Nations spokesperson said the executions and abductions happened Monday in northern Borno state.

Suspected Boko Haram militants killed at least 11 people including three aid workers in an attack on a military facility in Nigeria's northeastern Borno state late on Thursday, according to two security reports seen by Reuters.

Four Boko Haram suicide bombers killed 19 people in a city in northern Nigeria, the deadliest attack in months.