The CBI today doubled the reward to 10 lakh rupees to anyone providing credible information about the missing nurse Bhanwari Devi.The move comes within a fortnight of announcing a reward of 5 lakh rupees in the case. The information may be given at CBI Camp Office, Circuit House, Jodhpur in Rajasthan.Sacked Rajasthan Minister Mahipal Maderna is a key suspect in the case and has been questioned by the CBI twice last week.In a related development, CBI carried out searches at eight locations including the farms of Maderna and Congress MLA Malkhan Singh's brother and sister Parasram Bishnoi and Indira Bishnoi respectively.