State police with bloodhounds searched the area where Le was last seen, and authorities were continuing to search nearby, Yale Police Chief James Perotti said in a statement. The FBI was assisting, and investigators also were reviewing images from closed-circuit cameras, Perotti said. Her fiance, professors, colleagues, friends and family also were helping, Perotti said.
Asked about the possibility of foul play, Yale spokesman Tom Conroy said Thursday, "There's no evidence of it at this time."
Le was excited about getting married and is energetic and conscientious, said Debbie Apuzzo, who works in the pharmacology department.
Le, 4-foot-11 and weighs 90 pounds, is of Asian descent and has brown hair and brown eyes. She is from Placerville, Calif., the Yale Daily News reported. She received her undergraduate degree in bioscience in 2007 from the University of Rochester in New York, said Sharon Dickman, a university spokeswoman.
Her lab is in the Yale Medical School complex, slightly less than a mile from the main campus.
FBI agents were spotted Thursday at her New Haven apartment but declined to comment.