Serbian police said Saturday they discovered the training camp of an alleged Muslim terrorist group in a tense southern region, and arrested four Serbian Muslims. In a statement, the police said they found several tents and a cave that allegedly served as a training ground for the Wahhabis - an austere brand of Sunni Islam promoted by extremists, including Osama bin Laden and his al-Qaida fighters. The camp was located on a mountain near Novi Pazar, in the center of the predominantly Muslim region of Sandzak along the border with Bosnia and Montenegro, police added. In a daylong operation, the police found large quantities of plastic explosives, ammunition, face masks, military uniforms, bombs, food, water and other equipment, the police statement said.