Three persons wanted in various cases of murder, theft, robbery and snatching in different areas have been arrested when they were planning to rob a builder, police said on Friday. The trio identified as Nitin Kumar, Amit Sen and Amit Kumar have confessed to their crimes, Additional Deputy Commissioner of Police P S Kushwah said. Arms and several mobile phones have been seized from them. On receiving information about the presence of three, a special team was constituted to nab them when they came to Shantivan, Kishangarh road to rob a builder, police said.