”Police are reviewing and studying the CCTV footage of an establishment nearby,” Hachuela said.
He refused to give further details in order not to jeopardize the follow up operations.
The blast hurt three persons, identified in the police reports as Pepito Patricio, Arniel Pawaon and Freddie Tumindig.
Hachuela said police investigators are still gathering more evidences and statements from witnesses who may have seen the suspects.
It was the second bombing incident near Caltex Gas Station since January 11 when an attempt was foiled by a fruit vendor who noticed a box near her stall.
That box turned out to be containing IED fashioned from black powder, triggering devices and cut nails as shrapnel.
The same composition that the bomb experts found in Tuesday’s bomb attack.
Hachuela has appealed to the public to remain vigilant and alert the police of any suspicious looking individuals with suspicious items with them.