The Jamestown Foundation's Terrorism Monitor, 7 Jun 07:

The Role of Foreign Trainers in Southern Thailand's Insurgency
The first five months of 2007 have seen a dramatic increase in both the lethality and brutality of the Thai insurgency, prompting numerous Thai military officials to suspect the growing presence of foreign trainers. The arrest of an Indonesian on May 19 further raised suspicions. Nevertheless, Thai political leaders, including former Prime Minister Thaksin Shinawatra, head of the National Reconciliation Commission Khun Anand Panyarachun and current Prime Minister General Surayud Chulanont, along with the diplomatic community, have all insisted that the insurgency is a purely domestic affair with no foreign linkages. This view is being challenged by a growing body of evidence that shows that Thai officials have begun to speak more openly about the influence of foreigners on the Thai insurgents....
...and this excerpt speaks to the subject of the first post in the thread, threat migration:
...It took insurgents almost two years to develop IEDs larger than five kilograms. This year has already witnessed 15 and 20 kilogram devices used several times a week, causing much higher casualty rates, especially among police and soldiers. Many of the devices are similar to the one found and defused on May 28: a 20 kilogram ammonium nitrate bomb constructed in a fire extinguisher, stuffed with bolts, nuts and pieces of rebar and hidden on the side of the road awaiting an army convoy. The bomb was command detonated, but cell phone detonators are still currently used. Casio watches, which have been used routinely in Iraq, are now also regularly employed in southern Thailand....