A bomb blast near a Nigerian market has killed 31 people, a civil defense official said Friday.

Sa’ad Bello of the National Emergency Management Agency said another 38 people are being treated in hospitals.

There was no immediate claim of responsibility but Thursday evening’s explosion in the city Yola bore the hallmarks of the Islamic terror group Boko Haram.

The group has ramped up attacks in recent weeks after a months-long lull while a multinational force drove it from the towns where it had declared an Islamic caliphate.

More than 60 people have been killed in attacks since the weekend in Moaiduguri, the northeastern city that is the birthplace of Boko Haram.

The Associated Press contributed to this report.