The explosions occurred in Gombe, the capital of Gombe State, late Wednesday evening. They are the latest in a string of attacks that have caused more than 430 deaths this month alone.
"The bomb explosion claimed no fewer than 30 lives, while 105 other persons sustained injuries and were taken to the teaching hospital in Gombe for treatment," Red Cross official Abubakar Yakubu told the Nigerian news agency.
The death toll is likely to rise significantly, witnesses said. No group immediately claimed responsibility for the attacks.
Extremist terrorist group Boko Haram, which seeks to establish a state with its very strict interpretation of Islamic law, has killed more than 14,000 people since 2009 in northern Nigeria.