SUDANESE rebels have swept through a major town in North Kordofan state, residents say, widening an anti-government offensive in one of the insurgents' most audacious acts in years. "This is part of our strategy to overthrow the regime and we want to weaken the troops on the road towards Khartoum," said Gibril Adam Bilal, spokesman for Darfur's Justice and Equality Movement (JEM) which is part of a rebel coalition. Residents of Umm Rawaba, the second-largest town in North Kordofan, said rebels arrived Saturday morning on at least 20 vehicles for a brief occupation. They fired their weapons into the air, causing panic, but met no initial resistance from security forces, townspeople said. "We just saw some drones in the air," one resident said, adding the insurgents looted the market. Other residents said the town's inhabitants cowered in their homes as rebels shot up government buildings before withdrawing. JEM and other main rebel movements from Darfur are grouped in the Sudan Revolutionary Front (SRF) with insurgents from South Kordofan and Blue Nile states. Sudan Armed Forces (SAF) spokesman Sawarmi Khaled Saad said coalition rebels crossed from South Kordofan into North Kordofan where they targeted Umm Rawaba town. "They destroyed the communication tower and electricity station and looted civilian property and a fuel station," he said, quoted by the official SUNA news agency. "SAF troops in the town responded," Saad said. Fighting is still going on. A resident, however, reported no combat in the town but heavy explosions in the surrounding area, where he had seen Antonov bombers and helicopters in the air. "There are extensive air strikes in the Umm Rawaba area," Bilal said. Rebel forces had pulled out of the town but remained in the surrounding area where they blocked a highway, he said. The spokesman for the Sudan People's Liberation Movement-North (SPLM-N), which analysts say has controlled an area of South Kordofan just south of Umm Rawaba, said he had no information. SPLM-N is also fighting in Blue Nile state. Umm Rawaba, with a population of several thousand, is about 100 kilometres (60 miles) east of El Obeid, the capital of North Kordofan which produces gum arabica, an ingredient in soft drinks and other products. Sudan is the world's biggest producer of gum arabica. Although JEM has occasionally operated just over the Darfur border in the western part of North Kordofan, this is their first strike into the east of the state.