The verification drive, which is still going on, was started last year after Delhi Police Commissioner Amulya Patnaik decided to create a database of unverified migrants. The inspiration came from a similar initiative of the New York Police Department.
Pope Francis said it was sad that mistrust was "also seen at the political level, in attitudes of rejection or forms of nationalism that call into question the fraternity of which our globalised world has such great need."
Overall, about 700,000 migrants are estimated to be in Libya, the International Organization for Migration says. No one knows how many are imprisoned in secret camps run by people smugglers, where conditions are worse than in the official ones, MSF said.