HOUSTON -

Students, faculty and staff have been allowed to return to the Texas A&M University campus more than four hours after it was evacuated because of a bomb threat.

The all-clear was given about 4 p.m. Friday, more than four hours after a Code Maroon was issued at 11:34 a.m. via email.

University officials said everyone would have to leave by foot and not by vehicle.

All classes and activities were canceled and people were asked to head north to Church Street or south toward Anderson Street. University officials said buses would pick up students, faculty and staff in those areas and run off-campus routes only.

The university estimated 50,000 students were evacuated.

United Methodist Church and St. Mary's Catholic Church on Northgate in College Station have opened their doors to people needed temporary shelter during the evacuation.

The Aggies are scheduled to play the LSU Tigers on Saturday. University officials said they expect the game to be played as scheduled.

Easterwood Airport, which is owned by Texas A&M, was also evacuated.