(http://news.bbcimg.co.uk/media/images/79384000/png/_79384245_nigeriakanomaiduguri4641114.png) There was pandemonium as people ran for their lives.
But then several men then opened fire on the crowd, killing more people. Three of the gunmen were caught, and - as the terror turned to rage - they were killed on the spot, the BBC's Will Ross in Abuja reports.
BBC Hausa editor Mansur Liman said one witness at a local hospital had described the scenes there as being the most horrible he had ever seen.
The Central Mosque is where the influential Muslim leader, the Emir of Kano, usually leads prayers.
The emir recently called for people to arm themselves against Boko Haram.
Boko Haram has stepped up attacks against civilian targets since the Nigerian military launched an offensive last year.
The militants were also behind the kidnapping of more than 200 schoolgirls from Chibok in Borno state this year, an act that sparked international outrage.
(http://news.bbcimg.co.uk/media/images/75306000/jpg/_75306515_line976.jpg) (http://news.bbcimg.co.uk/media/images/79238000/jpg/_79238273_79002708.jpg) Boko Haram leader Abubakar Shekau has declared an Islamic state in the north-east Who are Boko Haram?
- 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 - also attacked police and UN headquarters in capital, Abuja
- Some three million people affected
- Declared terrorist group by US in 2013
Who are Boko Haram? (http://www.theinfostride.com/news/world-africa-13809501)
Profile: Boko Haram leader Abubakar Shekau (http://www.theinfostride.com/news/world-africa-18020349)
(http://news.bbcimg.co.uk/media/images/75306000/jpg/_75306515_line976.jpg) (http://news.bbcimg.co.uk/media/images/75306000/jpg/_75306515_line976.jpg)
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Source: BBC