MUMBAI: Investigators in the Mumbai terror attack are leaving nothing to chance and they have even booked Ajmal Kasab, the lone gunman captured, for entering the Chhatrapati Shivaji Terminus (CST) without a railway ticket.Kasab and his associate Mohammed Ismail Khan had gunned down 59 commuters at CST on November 26 last year.Kasab was caught by police at Girgaon Chowpatty while his associate Khan involved in the CST attack was killed during an exchange of fire."Kasab has been booked under various acts including Arms Act, Unlawful Activities Prevention Act, Explosives Act, Customs Act, Waging war against country and other various sections of Railway Act. Entering the railway premises without proper ticket is also one among the various offences registered against him," Joint Commissioner of Police (Crime) Rakesh Maria said.Though it was a small offence compared to other offences registered against him, crime branch officials said all these will have to be registered and showed in the chargesheet into the terror attacks, which is expected to be filed within a day or two.The names of Indian nationals Fahim Ansari and Sabauddin Ahmed, who had allegedly conducted the recce before the attacks, will be also listed in the main chargesheet, officials said.