An investigating team, which has been probing the CCTV footage, claimed that two culprits allegedly had planted bombs in tiffin boxes and put them on bi-cycles near Dilsukh Nagar area.
The explosives were planted ten minutes before the blasts which killed at least 16 and injured over 100 people on Thursday.
"We are examining the images at the moment. The pictures are not too clear, but we should be able to get something out of it," a police officer was quoted as saying.
Police sources, however, did not clarify their stand on the reports which claimed that wire of CCTV cameras were cut minutes before the blasts.
The officials was quoted as saying, "We are not aware of any such development and are looking into the footage we managed to get from the CCTV at the bus station."