"Officials are trying to rescue a 6-year-old boy who climbed into a balloon-like experimental aircraft built by his parents and floated into the sky over eastern Colorado. [...]http://www.cnn.com/2009/US/10/15/colorado.boy.balloon/index.html
The Federal Aviation Administration is trying to track the aircraft on radar and has notified the Denver International Airport. Shortly after noon (2 p.m. ET), the balloon was sighted two miles south of Evans.
CNN meteorologist Chad Myers estimated the wind would keep the vessel moving at 30 mph. Authorities say the craft is about 7,000 feet above the ground."
Edit: A sad update: from the NYTimes
"At 11 a.m. Mountain time, Falcon Heene, the 6-year-old son of Richard Heene accidentally lifted off in his father’s helium balloon. After flying for more than two hours, the half-deflated aircraft landed in an empty field.:-/
But when the balloon landed, according to KUSA-TV, the boy was not in the balloon, deepening the mystery.
Edit 2: Hooray! He's alive. Ciara just posted on google reader that "he was hiding in a box in the attic over the garage." The NYTimes story above has been updated with what happened.