The commander of Redstone Arsenal says 911 calls about a potential active shooter prompted lockdown; no shooter was found.
Authorities locked down post today amid reports of possible active shooter. About two hours later, the all-clear was given and officials said there were no confirmed injuries or arrests.
A safety drill was planned for tomorrow, but Redstone Arsenal spokesman Christopher Colster says he wasn't sure "at this point what happened" at the base near Huntsville. He says a "methodical investigation" was underway.
Colster had said the report of a shooter was not part of any exercise.
Before the lockdown was lifted, Governor Kay Ivey's office said it couldn't provide any details.
More than 30,000 government employees, civilians and contractors work daily at Redstone. It is home to Army missile defense programs and other military offices.
NASA's Marshall Space Flight Center, which oversees rocket propulsion operations, also is located at Redstone.
