A 30-year-old man has been arrested from Bihar for sending obscene and threatening emails to a PhD scholar at Indian Institute of Technology Bombay, the Powai police said on Monday. The accused, identified as Hemant Kumar, was a research scholar at IIT-Guwahati from where he was expelled in 2017 for harassing the 26-year-old complainant, a resident of Mumbai.

Kumar first saw the woman in the lab of Ranchi Research Center where they studied between 2015 and 2016, the police said. He started stalking her and messaged her on Facebook.