The Roanoke Times seems to be the source for the case:
http://www.roanoke.com/news/virginia/missing-uva-student-s-last-text-said-she-was-lost/article_fa7df5eb-0f59-5ff5-95ad-68737fa35a21.html
Now they are saying that it appears a man was following Hannah.
http://www.roanoke.com/news/virginia/new-video-shows-man-following-hannah-graham/article_4e3b6b32-78a5-54a7-93c9-85ce095b0f27.html
A man seen in a video following a missing University of Virginia student on the Downtown Mall early Saturday told police late Wednesday that Hannah Graham "looked to be somewhat physically distressed" and that he wanted to make sure she was safe. He also told police that he saw another man speak with Graham.
The man in the video, who is white, came to the police department at 10:15 p.m. Wednesday, the agency said in a news release. In addition to describing his own actions, he told officers that soon after he followed Graham a black male came up to her and put his around around her and stopped her. The two began speaking, the man told police.
"It appeared to the witness that the black male was either known to Ms. Graham or was trying to help her," police said. "The witness then walked away and he said that Ms. Graham and the black male were still standing and talking when he left. The black male is not shown in either of these videos."
Police said the white man, explaining his actions, told police Graham "looked to be somewhat physically distressed and he wanted to make sure she got safely to wherever she was going."