MANILA: Philippine police are looking into possible suspects behind the bombing at a Catholic mass in the country’s south, a regional police chief said on Monday after the blast that killed four people was claimed by Daesh militants. 

On Sunday, a powerful explosion ripped through a gymnasium at Mindanao State University in Marawi, a southern Philippine city that was besieged by pro-Daesh militants for five months in 2017. The death toll stood at four as of Monday, while around 50 others were injured from the blast. 

Daesh claimed responsibility for the attack late on Sunday, saying that its members had detonated an explosive device at the gathering, according to reports.  

“Following the explosion, the PNP (Philippine National Police) created a special investigation task group to focus and expedite the investigation relative to this incident … We (now) have persons of interest,” regional police chief Allan Nobleza told reporters, adding that one of the suspects was linked to a local militant group.  

“The investigation is still ongoing. In order not to preempt the investigation, we will not divulge the names.”  

Gen. Romeo Brawner Jr., chief of staff of the Philippines’ Armed Forces, said that Sunday’s attack may have been in response to a series of recent military operations that had targeted local militant groups.  

Philippine forces launched an operation targeting the local Dawlah Islamiyah cell in the southern province of Maguindanao on Friday, killing 11 suspected militants including the group’s alleged leader Abdullah Sapal. The militant group, which has been linked to bombings and other deadly attacks in the southern Philippines, pledged allegiance to Daesh in 2015. 

In another operation in Sulu province on Saturday, government forces killed Mudzrimar Sawadjaan, also known as Mundi, a senior leader of another Daesh affiliate, the Abu Sayyaf Group. Brawner said Mundi was the mastermind of two major attacks in the Sulu capital of Jolo, including the 2019 cathedral bombings that killed at least 20 people. 

Both Dawlah Islamiyah —also known as the Maute group — and the ASG were behind the 2017 Marawi siege, a five-month battle that killed more than 1,100 people and forced more than 300,000 others from their homes. 

“Because of the accomplishments … we believe that that could be one of the strong possibilities why this (attack) occurred,” Brawner told reporters in Marawi on Monday.  

“We will go after the perpetrators as soon as possible and use all resources at our disposal in order to make this happen.”