A top Asian terrorist suspect and the notorious Abu Sayyaf extremist group may have deployed militants to bomb targets in Metro Manila, according to a Philippine intelligence report seen by The Associated Press on Thursday.

Intelligence operatives fanned out in Metro Manila to thwart any attack as the military and police said they were taking the report seriously, although it remained unsubstantiated and came from only one source.

One of two security officials who were aware of the threat said one date mentioned for the possible bombings was June 12, when the country celebrated its Independence Day, but no attack happened. The officials spoke on condition of anonymity because of the sensitivity of the topic.

The heightened alert comes after the US State Department on Tuesday renewed its travel warning for the Philippines, saying terrorist attacks could occur in the restive Mindanao and even in Metro Manila. The US Embassy did not cite any specific reason for the latest warning.

The Philippine government has complained that such warnings fail to take into account an improving security situation.

Government troops and police have killed and captured hundreds of Abu Sayyaf militants in past years and the few recent attacks attributed to them have been mostly confined to far-flung communities in Basilan and Jolo. Surviving militants have been on the run in the jungles and crippled by a lack of funds, the military said.

Malaysian Zulkifli bin Hir, a long-wanted suspected terrorist believed to be hiding in Mindanao, and the Abu Sayyaf deployed the militants to bomb still-unspecified targets in Metro Manila, the government report said.

The militants belong to the Abu Sayyaf’s so-called Urban Terrorist Group, which focuses on attacks in cities and other urban areas, the report said.

The military commander in the capital, Tristan Kison, said he has not seen the report but added that authorities were constantly on the lookout for any threat from “people with bad intentions.”

Zulkifli bin Hir, a US-trained Malaysian engineer also known as Marwan, has been accused by US and Philippine authorities of involvement in a number of deadly bombings in the country. Washington has offered a $5-million reward for his capture.

Marwan is one of the few remaining important terrorist figures in Southeast Asia following the death or capture of his contemporaries in Jema’ah Islamiyah, al-Qaeda’s affiliate in the region. He used to plot attacks with Indonesians Umar Patek, who was arrested in Abbottabad, Pakistan, in January and Dulmatin, a master bomb-maker killed in the Indonesian capital of Jakarta last year.

Philippine troops backed by US training and intelligence have hunted Marwan in Mindanao in recent months.

Patek and Dulmatin fled to Mindanao in 2003 after they were implicated the year before in the nightclub bombings that killed 202 people, mostly foreigners, in the Indonesian resort island of Bali.

The latest travel advisory for US citizens replaces a similar warning issued in November. The US, along with Australia, Britain, Canada, France and New Zealand, warned of possible terrorist attacks in the Philippines, including in Manila, at the time but no violence transpired.

President Aquino has expressed dismay at the series of travel warnings, saying his government was not informed about the advisories even though they came from the country’s allies. He said the advisories jeopardized tourism and fostered public anxiety.

On Thursday Zamboanga City Mayor Celso Lobregat said the US travel advisory “hurts efforts to promote their towns for tourism and investments” as he stressed the province remains peaceful and secure.

Lobregat, who led Manila-based tourism journalists to explore local historical sites, said Zamboanga and the entire Mindanao remain “peaceful and secure” and there is no reason to be wary in going to tourist destinations there.

“It is unfortunate that when things happen in Mindanao, it is blown up in the international and national media and most of the times the news are datelined Zamboanga because reporters gather their information here,” Lobregat lamented. “It is really hurting our efforts in trying to promote tourism in Zamboanga and Mindanao.”