Two bombs went off in a Roman Catholic cathedral in the southern Philippines on Sunday, killing at least 20 people and leaving dozens wounded.

Two explosive devices detonated in intervals at the Jolo Catholic cathedral in the Mindanao region. At least 81 people have been wounded, authorities said, including 14 soldiers of the Armed Forces of the Philippines and two Philippine National Police officers.

The first device went off inside the cathedral, and the second one targeted nearby soldiers who rushed to help the victims of the first explosion.

On Sunday, ISIS claimed to be responsible for the bombings, via its Amaq News Agency. ISIS did not provide evidence for this claim, nor can CNN verify it.

The nation’s military and the police are securing the area and all casualties were immediately evacuated, regional officials said. Defense Secretary , Delfin N. Lorenzana condemned the bombing and said he has directed troops to, “heighten their alert level” and secure places of worship and public spaces, according to CNN.

Political leader of the Philippines, Delfin Lorenzana said, “As we convey our sincerest condolences to the families and friends of the victims and offer our sympathy to the peace-loving people of Sulu who are severely affected by this dastardly act, we assure our people that we will use the full force of the law to bring to justice the perpetrators behind this incident.”

He urged people to remain calm and avoid spreading panic in our respective communities to deny terrorism any victory.

Lakewood High School senior, Jack Hueter says,” ISIS is super dangerous and just because things aren’t happening in the U.S, doesn’t mean that we shouldn’t be worried.”