A bomb threat was phoned in early this afternoon, officials at Lone Star College-Tomball confirmed.
Officials said they received the anonymous threat by phone at around 1:30 p.m.
Tomball Police, the Harris County Sheriff's office, federal authorities and campus police were all on scene.
Students began the process of evacuating after officials sent out email and text alerts from the school's emergency notification system. Many were seen walking down SH 249.
"I got a text message from the school saying 'bomb threat evacuate Tomball now'," said LSC student Aaron Nester.
No one is being allowed on campus and officials have cancelled classes until further notice for precautionary reasons.
Updates are being provided at www.lonestar.edu.
UPDATE: No bomb was found, but police are still investigating who initiated the false threat.