The Islamic State (ISIS) has claimed responsibility for a deadly bombing at a Catholic Mass in the Philippines on Sunday, Reuters reported.

The bombing left at least four people dead and over 50 injured at Mindanao State University, according to Reuters. ISIS announced on Telegram that it was responsible for the explosion, The Daily Beast reported.

The Daily Tribune reported that ISIS had “detonated an explosive device on a large gathering of Christian disbelievers in Marawi City,” citing the SITE Intelligence Group.

“Extremists who wield violence against the innocent will always be regarded as enemies to our society,” President of the Philippines Ferdinand Marcos Jr. said in a statement on Twitter. “Rest assured we will bring the perpetrators of this ruthless act to justice.”