President Hollande of France, who hosted the summit, said regional powers had pledged to share intelligence and co-ordinate action against the group.
Last month it abducted 223 schoolgirls in north-eastern Nigeria, where it is based. Fresh attacks were reported in Nigeria and Cameroon overnight.
Thousands of people have been killed by Boko Haram in recent years.
The Paris summit brought together President Francois Hollande, Nigeria's Goodluck Jonathan, and their counterparts from Benin, Cameroon, Niger and Chad.
Afterwards, Mr Hollande said participants had agreed on a "global and regional action plan". (+ video) » | Saturday, May 17, 2014
