The institution in Maryland was placed on lockdown after a former student made threats online that appeared as though they were on campus, a source said.

A law enforcement officer shot a student at the U.S. Naval Academy on Thursday during a lockdown that was prompted by online threats from someone who had been kicked out of the institution, a source said.

The shooting on the Annapolis, Maryland, campus occurred after the midshipmen, which is what all students at the academy are called, mistook a responding law enforcement officer for a threat and struck the officer with a parade rifle used for training, the source said.

The student the law enforcement officer shot was hospitalized and is expected to be OK, the source said.