A Western intelligence report has warned against the "return of organized terrorist attacks" to Lebanon after monitoring broad movements of al-Qaida, which operates in Lebanon under different names like Fatah al-Islam and Asbat al-Ansar.

The report said "a large number of Islamic fighters" have infiltrated into the Bekaa Valley and north Lebanon across the Syrian-Lebanese border since the summer of 2007.

It said these groups "systematically" enter Lebanon and set up positions mainly in villages in the Western Bekaa and near the town of Abdeh north of the country.

Financing of these terrorist groups also seemed to be highly organized, according to the report.

It said some of these terrorist groups have settled inside Palestinian refugee camps which "take direct instructions from the Syrian regime."

The report said the return of terrorism to Lebanon began to increase since U.S. forces started bolstering security in Iraq and after al-Qaida leaders announced that they will not let down Lebanon's Sunnis and accused Hizbullah of attacking Sunnis in Lebanon.

Finally, it urged Lebanon to defuse the political tension and recommended that security authorities intensify their surveillance "before it's too late."