Six of the 50 Filipino-Muslims who allegedly underwent training at the Al Qaida camp of Osama bin Laden in Afghanistan have returned to the Philippines, some of them through the southern backdoor, and the rest through Pasay City's Ninoy Aquino International Airport, said an immigrations report.

One of them was identified as Akram Keyang Hadjirul, who arrived on board an Egypt Air flight from Cairo, on November 10. He carried a passport issued in Islamabad, Pakistan. Hadjirul has been in Pakistan since 1993, said senior intelligence immigrations officer Rudy David, in a report to fellow senior immigration intelligence officer, Cresen-cio Ablan.

"We received information that he had received four years of exclusive training in Pakistan and India," David said in the same report, alleging that Hadjirul spent some time in the Middle East too.

Hadjirul arrived with two other fellow-trainees, identified as Sambatra Sumayan Macapoli and Varzkhan Hassan Daud.

Meanwhile, three other suspected terrorist-trainees arrived at the airport aboard a Thai Airways flight on November 13. They were identified as Abdulrashid Guro, Rasul Cadaly and Alfarok Aguro.

David did not mention the names of those who returned through the southern backdoor, to reach Mindanao where several separatist groups such as the Abu Sayyaf and the Moro Islamic Liberation Front are based.

"In light of the international terrorist crisis, we cannot take matters like this for granted," David said, but added that authorities would have no basis to hold them for questioning.

"Some of these persons have been in Pakistan and Afghan-istan, for many years. They are suspected of having been part of terrorist groups, possibly the Al Qaida itself," David said.

The 'trainees' began arriving soon after the Northern Alliance started overrunning Taliban strongholds in Afghanistan early this week.

Interpol and Manila's foreign affairs department are monitoring the movement of the alleged terrorists.

Earlier, an intelligence report from Russia was sent to the defence department stating that 50 Filipino-Muslims were undergoing training at the Bin Laden camp in Afghanistan.

At the same time, the Philippines Embassy in Pakistan said there were 500 Filipino-Muslims who are scholars the religious schools in Pakistan. Some of these students have returned, too, to avoid being caught in the cross-fire between the pro- and antiU.S. led coalition that has bombed the Taliban forces in Afghanistan.

It was not clear if the trainees continued undergoing training with terrorist groups in the Middle East. It was not sure also if the students in Pakistan ever went to Afghanistan to be trained.