Cambridge - U.S. prosecutors say a Harvard University student trying to get out of taking a final exam made the bomb threats that led to the evacuations of four campus buildings this week.

A criminal complaint filed Tuesday by the U.S. attorney's office says Eldo Kim sent emails saying bombs had been placed around the Cambridge, Massachusetts, campus to Harvard police, two university officials and the president of the Harvard Crimson newspaper.

The messages said shrapnel bombs would go off soon in two of the four buildings, including one where prosecutors say Kim was supposed to take an exam Monday morning. The buildings were shut down for hours before investigators determined there were no explosives.

Kim is to make an initial court appearance Wednesday. It's unknown if he has an attorney.