WASHINGTON - THE discovery of a militant training camp in Indonesia, along with persistent terrorist attacks there, have increased US concerns that extremists are regrouping and eyeing Western targets in a country long viewed as a counterterrorism success story.

With President Barack Obama set to begin a visit Tuesday to the world's most populous Muslim country, there is renewed attention on terrorists in Indonesia who in the past year appeared to be banding together into a new Al-Qaeda-influenced insurgency.

Recent Pentagon moves to renew a training program with Indonesia's special forces and bolster military assistance show that the Obama administration believes the country needs more help tracking and rooting out insurgents, particularly those who rejoin the fight once they are released from jail.

The US has praised Indonesia's efforts to crack down on terrorists.

Government police and military authorities have captured or killed more than 100 terrorists over the past year.

US defence officials, however, worry about the overall threat. They're watching for any signs of movement or increased communications between Indonesian extremists and Al-Qaeda leaders in Pakistan and Afghanistan.

Mr Obama's long-promised visit to the nation where he lived from age 6 to 10 comes as US defence officials said Indonesia has exhibited both the will and the ability to pursue extremists.

Worries terrorism up in Indonesia