MAIDUGURI, Nigeria (AP) — At least 23 people were killed and more than 100 injured following suspected suicide bombings Monday night that targeted Maiduguri city in northeastern Nigeria, police said Tuesday, one of the deadliest attacks in the conflict-battered city in recent history.

Residents and emergency services earlier told The Associated Press that three explosions were reported in crowded places in Maiduguri, the capital of Borno state, including in a major market and at the entrance of the University of Maiduguri Teaching Hospital.

“Regrettably, a total of twenty three (23) persons lost their lives, while one hundred and eight (108) others sustained varying degrees of injuries,” Borno police spokesperson Nahum Kenneth Daso said in a statement that blamed the attacks on suspected suicide bombers.

No group has claimed responsibility for the attacks, but the blame quickly fell on the Boko Haram jihadi group, which in 2009 launched an insurgency in northeastern Nigeria to enforce their radical interpretation of Shariah law.

Boko Haram has since become stronger, with thousands of fighters and different factions, including the Islamic State West Africa Province, which is backed by the Islamic State group. Maiduguri city is at the heart of the deadly violence.