Brown University says the search for a missing student who was last seen on campus a week ago is expanding outside Providence to Boston, Connecticut, New York and Philadelphia.

Sunil Tripathi is a philosophy major at Brown who grew up in Bryn Mawr. He has been living in Providence since 2008. He was on approved leave from the Ivy League school.

Brown spokeswoman Darlene Trew Crist says in a statement Saturday that Providence and Brown police departments are leading the missing person investigation.

The search for Tripathi over the last six days focused on the greater Providence area. It involved distributing flyers, searching various neighborhoods and soliciting for information through social media sites.

Tripathi is 6 feet tall and was last seen wearing blue jeans, a black ski jacket, glasses and a wool hat.