New Delhi: The CBI Tuesday launched a "special drive" against alleged bank fraudsters across the country registering 14 separate cases involving Rs 640 crore of siphoned funds and carrying out coordinated searches at 50 locations in 18 cities across the country, officials said.

The agency teams swooped down at different locations in 12 states across the country in a coordinated action against the promoters and directors of the companies made accused in the cases, they said.