The Central Bureau of Investigation, CBI on Monday questioned former minister of Rajasthan Mahipal Maderna who was arrested in connection with the alleged kidnapping and murder of a nurse Bhanwari Devi.AIR correspondent quoting official sources said that Maderna's questioning will continue. Mr Maderna was yesterday brought to Delhi from Jodhpur by the CBI for further interrogation in the case.Taking the probe further, CBI also announced a reward of five lakh rupees for any information leading to the arrest of another suspect Bishna Ram Bishnoi, who allegedly played an important role in the disappearance of Bhanwari Devi in September.