Twenty-eight Naxals, four of whom had bounties of over Rs one lakh on their heads, surrendered at the new police camp in Chikpal area of Dantewada district on Sunday.The four ultras, who had rewards on their heads, have been identified as Manglu Madkami, Baman Kawasi, Handa and Podiyami Gangi (woman).While Madkami had a reward of Rs 2 lakh on his head, the three others had a bounty Rs 1 lakh each on their heads.Dantewada Superintendent of Police Abhishek Pallava told media persons that the ultras laid down arms in front of police personnel and the Central Reserve Police Force (CRPF) officials.The arrested Naxals said that they have arrested due to their disenchantment with the Maoist's ideology and hope to see development in their native areas, the SP said.All 28 were given Rs 10,000 each as "encouragement money" and further assistance will be provided to them under the state government's Surrender and Rehabilitation Policy, the SP said.