Utah Biological Army base reopening after lockdown still no explanation

The Associated Press
Officials say Dugway Proving Grounds has reopened for incoming personnel, hours after it was locked down to resolve a "serious concern."
Army base spokeswoman Paula Thomas says personnel were allowed to enter the base early Thursday and preparations were under way to allow people inside to leave.
Base commander Col. William E. King late Wednesday announced that gates were locked to both incoming and outgoing personnel, saying there was a serious concern but that no one was in danger.
But neither King nor Thomas have disclosed any details about the problem.
The Salt Lake Tribune reports that a lockdown began at 5:24 p.m. MST Wednesday with 1,200 to 1,400 people inside Dugway at the time.
Military weapons are tested at Dugway, located about 85 miles southwest of Salt Lake City.