MOSCOW (Sputnik) - The death toll in the blasts that hit a cathedral in the southern Philippine province of Sulu on Sunday morning has climbed to 20 people, while the number of injured reached 81, local media reported, citing police.

One improvised explosive device detonated inside the Cathedral of Our Lady of Mount Carmel, located in Sulu's Jolo municipality, and another at its entrance, the Rappler news portal specified.

According to the Rappler news portal, police have announced that 20 civilians are among those killed in the explosions, while soldiers account for the rest of the victims.

Death toll from twin explosions that struck the Jolo cathedral rises to 27. Authorities say 77 others are wounded. Read https://t.co/flQeYEOd1k pic.twitter.com/vRl6Xelj4m — SunStar Philippines (@sunstaronline) January 27, 2019

Mujiv Hataman, the governor the Autonomous Region in Muslim Mindanao, where the Sulu province is located, believes that the attack has been most likely committed by terrorists.

Video: At least 27 killed in twin blasts at church in southern Philippines https://t.co/drA2NivUU4 pic.twitter.com/J1WyHnVvoy — CGTN (@CGTNOfficial) January 27, 2019

"At this point in time, we do not want to make speculations, but we can be sure that this is 99% the handiwork of terrorists," Hataman was quoted as saying by the news portal.

Later in the day, Pope Francis condemned the bombing attack inside the cathedral referring to it as "terrorist attack".

At least five soldiers were among those killed.

According to the police, all the injured people were evacuated immediately.

READ MORE: At Least 2 Killed as Bomb Detonates Near Shopping Mall in Philippines — Reports

The country's Armed Forces and National Police are currently working to ensure security in the area.