(http://news.bbcimg.co.uk/media/images/75329000/jpg/_75329063_nigeriamaidugurigwozamandara4640614.jpg) The meeting took place on the sidelines of the London summit on ending intercourseual violence in conflict, co-hosted by Mr Hague and UN special envoy and actress Angelina Jolie.
It follows last month's summit in Paris where regional powers pledged to co-ordinate action against the group.
Earlier, Niger's Foreign Minister Mohamed Bazoum defended the slow progress in the fight against Boko Haram.
He told the BBC Focus on Africa radio programme that measures such as sharing intelligence and setting up a new regional headquarters for aircraft involved in surveillance and possibly "operations in the field" took time. This is to be set up in Chad's capital, N'Djamena, he said.
Nigerian President Goodluck Jonathan declared a state of emergency in May 2013 in the three northern states where Boko Haram is most active - Borno, Adamawa and Yobe.
The militants retaliated by stepping up their bombing campaign in cities and raiding small towns and villages.
(http://news.bbcimg.co.uk/media/images/74982000/jpg/_74982323_line976.jpg) Who are Boko Haram? (http://news.bbcimg.co.uk/media/images/75329000/jpg/_75329065_75007899.jpg) Boko Haram leader Abubakar Shekau has been designated a terrorist by the US government
- Founded in 2002
- Initially focused on opposing Western education - Boko Haram means "Western education is forbidden" in the Hausa language
- Launched military operations in 2009 to create Islamic state
- Thousands killed, mostly in north-eastern Nigeria - but also attacks on police and UN headquarters in capital, Abuja
- Some three million people affected
- Declared terrorist group by US in 2013
Source: BBC.co.uk