"The threat is real, terrorists are already here. What they are looking (for) is just one opportunity," Reyes said at a briefing on terrorism at the Bulwagan ng City Hall hosted by Quezon City Mayor Feliciano Belmonte Jr.
Reyes called on the mayors to update their security plans to head off the threat posed by terrorist groups and urged them to implement a comprehensive action plan.
Police Superintendent Felipe Roxas explained the threat from terrorist groups is real.
He identified the Abu Sayyaf, Rajah Solaiman Movement and the Jemaah Islamiyah (JI) as the main threats to the nation’s security, particularly in Metro Manila.
"A large-scale terrorist attack, particularly in Metro Manila, remains a strong possibility, the threat is real," Roxas said.
He said any terrorist may even use a motorcycle for a suicide bomb attack.
Roxas cited the Australian embassy attack in Indonesia on Sept. 9 last year that left eight people dead and at least 100 people wounded.
Roxas warned the mayors of the possibility of another train and bombing attack similar to the Rizal Day bombings in December 2000.
Interior Undersecretary Melchor Rosales, a retired military general like Reyes, presented a comprehensive disaster and crisis management plan, highlighting the role of local officials in responding to terrorist attacks.
The plan includes deployment of barangay watchmen and security guards to counter a "clear and present danger" in Metro Manila.
Manila Mayor Lito Atienza led the Metro Manila Mayors League in the forum as well as representatives from the Metropolitan Manila Development Authority.
National Capital Region Police Officechief Director Vidal Querol led the chiefs of police and fire marshals during the meeting.