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Analysis: Tomi Oladipo, BBC Africa security correspondent, LagosIt is clear it is not only Christians who face the threat of violence in northern Nigeria. This is a major mosque, frequented by one of the country's most influential Muslim leaders, Kano's emir.
Emir Muhammad Sanusi II has criticised Boko Haram and only last week urged civilians to take up arms against the group. This has raised questions as to whether he was the target of today's attack - although he was out of the country at the time.
While violence in remote rural areas is no longer news for many Nigerians, the increasing attacks in larger cities are sending shockwaves across the country. The military's ongoing counter-terrorism efforts will need more concrete results to boost public confidence.
(http://news.bbcimg.co.uk/media/images/75306000/jpg/_75306515_line976.jpg) Our editor says Boko Haram will be the main suspects, as the attack bore all the hallmarks of the group.
No-one from the group has yet commented.
Boko Haram has stepped up attacks against civilian targets since the Nigerian military launched an offensive last year.
Boko Haram was 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) 'Call for anarchy' The emir, Muhammad Sanusi II, is currently in Saudi Arabia.
Reliable sources in the emir's palace told the BBC that he had arrived in Saudi Arabia late on Thursday night from Paris.
(http://news.bbcimg.co.uk/media/images/79372000/png/_79372918_nigeriakano4641114.png) Boko Haram has targeted the city, the largest in northern Nigeria, several times during its insurgency.
But most of its attacks are further east - in Borno and neighbouring states.
Earlier this month, the emir told a prayer meeting that people should "acquire what they need" to protect themselves.
A police spokesman said the emir's comments were a "call for anarchy" and should not be acted on.
The emir, who until earlier this year was governor of Nigeria's central bank, normally stays silent on political matters.
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Source: BBC