JAKARTA, Indonesia (AP) — A top terrorism researcher says the attack by Islamic State group-affiliated militants on a Philippine city has galvanized its Southeast Asian supporters and spells trouble for the region.

The new report by Sidney Jones, director of the Jakarta-based Institute for Policy Analysis of Conflict, was released Friday as the occupation of Marawi nears two months despite a sustained military counterattack.

Jones said there now may be a higher risk of attacks on other Philippine cities, and that cooperation between militants across regional borders could expand.

She said militants in Indonesia and Malaysia could redouble efforts to attack police and may also target foreigners.

She said photos posted by militants on social media during the initial assault "strengthened the desire of ISIS supporters in the region to join the battle."