A military base in Alabama was on lockdown on Tuesday following reports of a possible active shooter at the facility, base officials wrote on Twitter.
Redstone spokesman Christopher Colster told reporters that authorities have not yet confirmed whether there is a gunman on the Arsenal grounds.
"We do not believe there is a threat or we would not have opened the installation back up", Colster said.
A drill was planned for Wednesday morning, but they have been told this is not a drill, reported local news station WHNT.
Reports stated that the Federal Bureau of Investigation is on their way to the scene.
An Army email sent to facility personnel and relatives was more explicit than the tweet, saying an active shooter was on the building's second floor.
Authorities locked down post today amid reports of possible active shooter.
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Marshall Space Flight Center and Redstone have both issued alerts.
Madison County Sheriff's Deputies and Huntsville Police officers block Martin Road leading to Redstone Arsenal Gate 1, Tuesday, June 27, 2017 in Huntsville, Ala.
The base was supposed to stage an active shooter drill this week, but Redstone officials confirmed the incident is not a training excercise. However, he would not say whether the active shooter report was part of that exercise.
The governor's office says Alabama Gov. Kay Ivey is being updated about the situation, but her office couldn't provide any details.
Redstone is home to Army missile defense programs and other military offices.
The incident began just after 10 a.m. on Tuesday when reports emerged of a possible shooting at or near the Sparkman Center at Redstone Arsenal. All gates to Redstone Arsenal are closed until further notice. "Please join me in praying for the safety of everyone on base", he said on his Twitter account. The Arsenal is a garrison for a number of tenants including the United States Army Materiel Command, Army's Aviation and Missile Command, the Missile Defense Agency of the Department of Defense, and NASA's Marshall Space Flight Center.