NEW DELHI (APP) - The Mumbai Crime Branch has filed a long chargesheet in a Mumbai court but without any proof of involvement of ISI in Mumbai attacks. Mumbai's Joint Commissioner of Police Rakesh Maria told newsmen that investigations have not thrown up anything that could speak about the involvement of Pakistan's Inter-Services Intelligence agency. "It is an operation carried out by the LeT and we have not yet come across the involvement of ISI," he added. In a jam- packed court room, the Special Public Prosecutor Ujjwal Nikam informed the Judge that some of the wanted accused have been arrested by Pakistan's Federal Investigation Agency. All 12 cases registered in the attack were clubbed as one in the chargesheet which lists a total 2,202 witnesses. Meanwhile, the chargesheet proved local support to the attacks as Indian nationals Fahim, Sabahuddin provided marked maps, details to help terrorists to strikes. Fahim Ansari and Sabahuddin Mohammed along with Ajmal Kasab will face trial in the coming weeks in a special court set up inside the Arthur Road Jail in Mumbai. The trial into the 26/11 attack case will begin in the first week of March. Special Public Prosecutor Ujwal Nikam said "We would try to complete the trial within three to six months". He also said the court has permitted the city crime branch police to continue their investigations into the 26/11 attack case. "Once we are through with the remaining part of the investigations, we will be filing a supplementary chargesheet in the case," Nikam said, adding that the court had given a go-ahead to the police to file a supplementary chargesheet in the case, media reports quoting Nikam said.