Some reports suggest the death toll could be as high as 42, with dozens more injured.
The explosions happened in and around a mosque as Muslims were preparing for afternoon prayers.
No-one has yet said they were behind the bombings, but the Islamist militant group Boko Haram has launched previous attacks in Mubi.
Boko Haram has waged a campaign of violence since 2009 to try to create an Islamic state in northern Nigeria.
The violence has killed about 20,000 people...