ORLANDO, Fla. — A high school and nearby elementary school were placed on "lockout" Tuesday morning because of an investigation into a suspicious package on campus.

• Boone High, Blankner Elementary in Orlando placed on 'lockout'
• Suspicious package found on Boone High campus, police said
• Both schools were cleared for normal operations 2 hours later

The package was found in building 800 on the campus of Boone High School at 2500 S. Mills Ave., Orlando Police said.

Investigators determined the package to be a backpack, but the school received a bomb threat overnight, police said.

Blankner Elementary School was also temporarily placed on lockout but returned to normal operations a little more than an hour later, and Boone returned to normal operations just after 11 a.m.

A "lockout" is when students and workers can't leave or come on campus, but classes continue, and people can move about within campus.