Gizmodo article is actually decent: "While helium doesn’t appear to be a problem at the moment, deflation is. ABC27 reports: “Authorities said it is equipped with a device to slowly deflate it, but it apparently is not working.” Whoops. If you see the free-floating balloon on the loose, call 911. Do not attempt to engage."

http://gizmodo.com/theres-a-runaway-defense-department-blimp...