Businessman Arup Saha went missing from Durgapur industrial city in Burdwan district in April 2014.
After the state police failed to trace him, his wife Rita Saha filed a habeous corpus petition before the high court seeking a direction to the police to find him.
State CID, which was then investigating the case, today submitted a report before the court stating there were indications of extremist connection in the matter.
The court also directed CBI to file a report within four weeks.