A powerful explosion ripped through a Catholic Mass in the southern Philippines on Sunday morning, killing at least four people and injuring several others. The incident occurred while the morning Mass was underway in a gymnasium at the state-run Marawi State University, causing panic among dozens of worshippers present at the scene.A powerful explosion ripped through a Catholic Mass in the southern Philippines on Sunday morning, killing at least four people and injuring several others. The incident occurred while the morning Mass was underway in a gymnasium at the state-run Marawi State University, causing panic among dozens of worshippers present at the scene.