One of the bombings is reported to have killed six people and injured others at a wedding ceremony on Saturday, according to BBC.
The state’s emergency management agency said the suspected suicide bombers attacked a wedding, funeral and hospital in the town of Gwoza.
Borno state has been at the centre of a 15-year insurgency by Boko Haram Islamist militants, which has displaced more than two million people and killed more than 40,000.
Boko Haram gained international notoriety in 2014 when it kidnapped more than 270 schoolgirls from the town of Chibok, also in Borno state.
Authorities said 18 deaths had been confirmed on Saturday, a toll that included children, adults and pregnant women.
Some local media have reported a much higher toll – Nigeria’s Vanguard and This Day newspapers said at least 30 had been killed in the blasts.
A curfew has been imposed by the mi