By Randy Fabi and Manuel Mogato
JAKARTA/MANILA (Reuters) - Southeast Asian militants who claim to be fighting for Islamic State in the Middle East have said they have chosen one of the most wanted men in the Philippines to head a regional faction of the ultra-radical group, security officials said on Thursday.
The claim was made in a video that was recently posted on social media, possibly last week, a military intelligence official in the Philippines told Reuters.
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The video is significant, experts say, because it shows that Islamic State supporters are now being asked to stay home and unify under one umbrella group to launch attacks in Southeast Asia, instead of being drawn to the fight in the Middle East.
Authorities in the region have been on heightened alert since Islamic State claimed an attack in the Indonesian capital Jakarta in January in which eight people were killed, including four of the attackers.
In the 20-minute video seen by Reuters, young men and some children in military fatigues are shown carrying and training with weapons, and holding Islamic State flags. A section of the video showed some of these men engaging in gunbattles in jungles but it was not clear where and with whom.
The video also showed three men apparently being executed, but it was not clear where and who they were.
The authenticity of the video and when it was taken could not be independently verified.
In the video, a man authorities in Malaysia have identified as Mohd Rafi Udin, a Malaysian militant currently in Syria, says in Malay: "If you cannot go to (Syria), join up and go to the Philippines."
In the video, Udin also urges Muslims to unite under the leadership of Abu Abdullah, a Philippine militant leader who pledged allegiance to Islamic State in January.
Abu Abdullah, also known as Isnilon Hapilon, is a leader of the Philippine militant group Abu Sayyaf. He is on the FBI's most wanted list for his role in the kidnapping of 17 Filipinos and three Americans in 2001 and carries a bounty of $5 million.
The video was released to mark Islamic State's acceptance of allegiances from jihadists in the Philippines, the first formal recognition of a Southeast Asian group, said Ayob Khan Mydin Pitchay, chief of Malaysia's police counter-terrorism unit.
"This video is not just propaganda, but is a serious threat. We are definitely expecting more attacks in this region," Pitchay told Reuters.
Hapilon is known to be based in the interior hills of the island of Basilan in the Mindanao region of the southern Philippines. In April, at least 18 Philippine soldiers were killed and 53 wounded in an attack on his followers on the island.
For decades, Abu Sayyaf has been known for extortion, kidnappings, beheadings and bombings, and is one of the most brutal Muslim rebel factions in the south of the largely Christian Philippines.
The group has posted videos on social media sites this year pledging allegiance to Islamic State militants in Iraq and Syria.
The latest video appears aimed at recognizing Hapilon as the Southeast Asian leader of the group, anti-terrorism experts said.
"I think this is a very significant video," said Sidney Jones, a Jakarta-based security expert. "This acknowledges support from Indonesia and Malaysia."
"It suggests there will be more efforts to get people to actually go to Mindanao to launch operations from there."
The Jakarta attacks in January were claimed by Islamic State. But the attack did not bear the hallmarks of other spectacular strikes by the radical group - the militants lacked sophisticated weaponry and were amateurish in the execution.
Some security officials fear a more organized and better trained militant group could launch far deadlier attacks in the region.
But Philippine military officials dismissed these concerns, saying the video was just propaganda and should be ignored.
"People should not be bothered by this," said Philippine military spokesman Restituto Padilla "Authorities are working on this. They can be identified, and they can be hunted down."
(Additional Reporting by Rozanna Latiff in Kuala Lumpur and Kanupriya Kapoor in Jakarta; Editing by Raju Gopalakrishnan)