March 20 (UPI) -- U.S. federal immigration authorities detained a Georgetown University researcher, his lawyer said. Indian national Badar Khan Suri was arrested Monday outside his home in Arlington, Va., which has been confirmed by his lawyer, Politico reported . A lawsuit was filed Tuesday seeking his release. Advertisement Masked federal agents arrived at his home and told him his visa had been revoked. Suri is a postdoctoral fellow on a student visa and has not been charged with a crime.