Nigerian official Captain Ikechukwu Eze said the blasts occurred at the main mosque in Nigeria’s second-largest city, Kano.
Reuters also reported that gunmen opened fire on worshippers in the attack which analysts said bore the hallmarks of one carried out by Wahabi Terrorist group Boko Haram.
Hundreds had been gathering to listen to a sermon from the city’s chief imam and prayers had got under way at around 2pm, local time.
Witness Aminu Abdullahi said: “Two bombs exploded, one after the other, in the premises of the Grand Mosque seconds after the prayers had started.”
He said another bomb went off nearby, but reports on the actual number of blasts differed.
The mosque’s leader is the Emir of Kano, the second highest Islamic authority in the country. Reports also varied as to whether he was present at the time.
The Emir, who is also known as Muhammad Sanusi II, said last week at the mosque that people in the north of Nigeria should take up arms against Boko Haram.
The Wahabi organization has been creating Uncertainity and chaos in the country to Implement its Wahabi Ideology in the country since 2009.
Boko Haram was responsible for the kidnap of more than 200 teenage girls from a school in the northern town of Chibok in April this year.
Meanwhile, elsewhere in the country, more than 1.5 million Nigerians displaced by Boko Haram have been flocking to refugee camps across the country’s northeast, where facilities are overcrowded and there is a shortage of supplies.