The Civil Aviation Authority of the Philippines on Thursday said that it has heightened the security of all its 42 commercial airports after the Air Traffic Service received a warning via email that planes leaving Manila for Puerto Princesa, Mactan-Cebu, Bicol, and Davao International Airports are about to be detonated by a bomb.

Following the information, all airports were immediately ordered to intensify security measures while verification process is under way.

CAAP Security and Intelligence Service assistant director general II retired MGen. Ricardo Banayat and all CAAP airports and area centers should augment appropriate security personnel to meet the anticipated high volume of passenger and vehicle traffic.

Stringent access control procedures for both personnel and vehicles will be implemented, accompanied by thorough inspections of passengers and cargo.

CAAP-CSIS personnel are also collaborating closely with the Philippine National Police Aviation Security Group and military authorities, intensifying intelligence and monitoring operations with other security units.

Continuous foot and mobile patrols are also being conducted within both the airside and landside areas of the airport complex.

Meantime, Airport Security Coordination meetings will also be convened with all relevant stakeholders to ensure the strict implementation of security measures aimed at preventing any unlawful interference with civil aviation.

In order to avoid any difficulty, they also advise international travelers to get to the airport at least three hours prior to their departure as CAAP also urged the general public to comply fully with security agents and to exercise caution when visiting the airport.

"Our primary priority continues to be safety and security, and these steps are being taken to protect everyone who uses our airports," CAAP said.

Meantime, the Manila International Airport Authority assured the traveling public that it had instituted measures to ensure the safety of the Ninoy Aquino International Airport passengers, flights and facilities.