Metro Manila (CNN Philippines) — The police have released on Wednesday a composite sketch of the primary suspect in the Davao City blast that killed 14 and injured around 68 others.

The composite image — based on witness recollection -— showed a man, about 30 years old, 5' 7" to 5' 8" in height, with a slim build and fair to dark skin.

Look: Sketch of Davao City bombing suspect

Investigators said this was the man who carried the bag that contained a bomb to the Roxas Avenue night market and left it under a massage chair. Witnesses said he wore a mask and a bonnet the whole time, even when he was having a massage.

Watch: The deadly Davao City blast in 90 seconds

This main suspect is also one of the four persons of interest earlier identified by the police. The bomb used turned out to be a twin bomb: a 60mm mortar round attached to a second 81mm round. It might be too early to say, but probers said this bore the hallmarks of homemade explosives assembled by Islamist terror groups.

Bandit-drug lord tandem

Director Benjamin Magalong, PNP deputy police chief for operations, said various information had been reaching them, including the narco-terrorist angle.

"We can say that they are extremist... We are getting information, you know, politicians who are involved in drugs have funded the bombing," Magalong said.

Anti-drug officials said they found drug paraphernalia in captured Abu Sayyaf dens.

Philippine Drug Enforcement Agency (PDEA) Region 11 director Adzar Albani said the bandits had also possibly gone into the drug trade — using the ransom money as capital to buy and sell drugs.

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Meanwhile, the head of the Moro National Liberation Front (MNLF) in Davao City said the bombing had nothing to do with Muslims or Islam.

"This effort is to embarrass the President. And Davao City is his home base," MNLF Davao City chair Rolando Olamit said.

Even the commander of the special investigation task group, Sr. Supt. Valeriano de Leon, cited that no less than President Duterte had said that the bombing was 80 percent an offshoot of the all-out operations vs the ASG in Sulu and 20 percent possibility that it was a form of retaliation from drug syndicates.

CNN Philippines' JC Gotinga contributed to this report.