"If any suspicious activity was noticed at the stations, on the platform or in train, the details may be communicated. A reward of upto Rs five lakh will be given for any information leading to the identification of the offenders or their apprehension", DGP K Ramanujam said.
Crime Branch-CID investigating the May 1 low-intensity blasts on Bangalore-Guwahati Express, that also left 14 persons injured, was pursuing all clues collected from the scene and leads furnished by passengers and a vast amount of CCTV footage was collected and being scrutinized, he said.
He said any individual who has photographs or videographs taken at any of the stations on the route or in the train during its journey on April 30 and May 1 could pass them on if they contain images of unknown or suspicious persons, adding the identity of the person providing information would be kept confidential.
The public could contact phone numbers 7708654202 or 044-22502500 or 22502510 or Email:cbcyber@nic.In, the release added.
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Meanwhile, police arrested a man hailing from Bangalore for making an anonymous call yesterday that a bomb would explode in the central station, which turned out to be a hoax after a thorough search.
He was produced before a city court which remanded him to judicial custody, they said.
According to police, he disclosed he had made the call to create panic in the minds of commuters and wanted to see that it was covered by the media.
Police said they also found that he had cheated some people of money after falsely promising help in locating missing persons.
A 24-year-old woman, employed with TCS in Bangalore, lost her life while 14 others injured in the blasts that had occurred soon after the train pulled into platform number nine at the Central Railway Station.