He is described as top student who got "stressed out." Police said they came to his dorm a week ago because he shouting and acting out. A teacher described the leader of an elite study group as suddenly going quiet.

So what caused University of Maryland, College Park sophomore Alexander G. Song 2nd to post messages like this on the Internet, according to police, leaving him facing criminal charges and placed in a psychiatric ward:

"I will be on a shooting rampage tomorrow on campus," and "hopefully I kill enough people to make it to national news." Another post, police said, warned: "stay away from the Mall tomorrow at 1:30."

Few people are talking in enough detail to determine whether the statements attributed to him were threats or a rant, and what happened to a student who was in several honor societies and, as a sophomore, was studying how to purify methane gas to turn it into an alternative energy source.

Police say Song had no weapons and no means to get any. Read the complete story here.