More than 300 children and 12 teachers have been abducted by gunmen during an attack on St Mary’s School in north-central Nigeria’s Niger state, the Christian Association of Nigeria (CAN) said.

Nigeria’s president has postponed his trip to this weekend’s G20 summit after promising to intensify efforts to rescue 24 schoolgirls who were abducted by gunmen earlier this week in a north-western region of the country.

A schoolgirl who was abducted with 24 others from a dormitory in Nigeria has escaped and is safe, the school’s principal told The Associated Press on Tuesday.