Nigeria: Boko Haram 'kill 28 in new rampage'

Gunmen believed to be from the Nigerian militant group Boko Haram have killed 28 people during a rampage through three villages in the north of the country.

All three attacks happened on Thursday. One took place next to Chibok, where more than 200 school girls were abducted last month.

Since the girls' abduction more than 450 civilians are thought to have been killed by the group.