Kolkata: Since the morning of Friday, numerous pack of CBI officers launched a marathon raid operation in the offices of the Silicon group of industries in Kolkata and West Bengal. According to CBI sources, raids have been carried out in Salt Lake, Park circus and 15 other places of West Bengal. It is heard that raids have been taking places in the hide outs of more than 100 Silicon officers. It is suspected that there had been some kind of transaction between the group and Sudipto Sen. Based on such assumptions, the Central detectives are carrying out the raid in the houses and office of the Silicon officers. Previously, the Silicon Boss Shivnarayan DAs was arrested by the CBI on such said grounds.