From www.wdwinfo.com

Magic Kingdom's Tomorrowland evacuated due to suspicious phone call
Dec 22, 2013

Tomorrowland at Walt Disney World's Magic Kingdom was shut down last night after the park received a suspicious phone call, which turned out to be a prank. Orange County Sheriff's Office spokeswoman Jane Watrel said the evacuations were done as a precaution and lasted about two hours. No details were released on the content of the phone call, but Watrel said that it may have come from out of state. More investigations will be taking place. The attractions were reopened before park closing.