Serbian police have said they have uncovered caches of ammunition and explosives in what they said was the training camp for Muslim fighters in the country's south.
They also said that they had arrested four Serbian Muslims during the raid on a complex of several tents and a cave on a remote mountain near the town of Novi Pazar on Saturday.
In a statement the police said the men belong to the Wahhabi sect of Islam and came from the town of Novi Pazar, the main town in the predominantly Muslim Sandzak region, which straddles the Serbia-Montenegro border.
In a day-long operation, the police said they found large quantities of plastic explosives, ammunition, face masks, military uniforms, bombs, food, water and other equipment.
Also found were "propaganda terrorist material, military survival instructions, geographic charts and several CDs," the police statement said.
Four people were arrested, all from Novi Pazar, while one person managed to escape, the statement said.
The police statement did not specify whether the group was planning any attacks in Serbia or elsewhere, or whether it had ties to other Islamic terrorist groups.
Western intelligence reports leaked recently have suggested that Sandzak, as well as Muslim-dominated regions in neighboring Bosnia, could be an ideal recruitment spot for the so-called "white al-Qaeda" - Muslims with Western features who could easily blend into European or US cities to execute attacks.
Several incidents have been reported in Sandzak within the Muslim community, with the Wahhabis accusing local Muslim clerics of failing to practice "true" Islam, and disrupting prayers at local mosques.