U.S. Attorney Jim Letten says a 21-year-old Loyola student faces federal charges after allegedly sending threats to blow up a campus building.

Officials say the student, Evelyn A. Hubbard, sent two email threats to blow up Monroe Hall on the Uptown campus in November.

Hubbard later admitted to the FBI that she was scheduled to take an exam at Monroe Hall that morning, and sent the emails "as a joke," according to Letten.

Prosecutors say the first email was sent at 9:00 a.m. and "threatened five unnamed professors in Monroe Hall and called for an immediate evacuation of the building by 9:33 a.m."  The second email arrived at 9:27 and contained a threat to blow up the building, according to Letten's office.

Letten says the campus police department contacted the FBI, which traced to the emails to a Loyola University computer and to a cell phone linked to Hubbard.

Agents arrested Hubbard on a charge of sending threatening communications through interstate commerce, which carries a maximum penalty of five years in prison and a $250,000 fine.