Even as there is celebration within the Tata Group for the new deal with Singapore Airlines, old ghosts are resurfacing. The Economic Times recently ran a story on how the Serious Fraud Investigation Office (SFIO) probe into the Rs 1,700-crore investment by the Tata Group into Unitech in 2007 is near completion. It says the SFIO, in an interim report in April, has raised serious questions on the purpose of the deal and reopened the group’s connection with the 2G scam.