RAIPUR: Naxals fired rockets and opened heavy gunfire at a camp of paramilitary ITBP in Kondagaon district of Chhattisgarh in the wee hours today.Officials said the attack was launched at the company base of the 41st battalion of the Indo-Tibetan Border Police Force in Ranapal area after a large number of Maoists surrounded it from three sides."The attack was launched at about 12:40 AM and ended at 3 AM today. Four rockets were fired inside the camp. Both the sides exchanged about 600 rounds of bullets," they said.Naxals later retreated in the jungles and no casualties were reported on the forces' side."It is estimated that about 100 armed Naxals launched the attack," they said.