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. He said there was no evidence that any shots were fired. It was later confirmed by Holliday the 911 calls came from the Sparkman complex.
"We want the entire community to know that this arrest eliminates any threat to Huntsville or citizens of Madison County", Dorning said.
The base is the army's centre for rockets and missiles and is also home to the NASA Marshall Space Flight Centre. "That in itself drove us to our response".
A spokesperson told AL.com that no one is in custody but there is still an investigation into a possible active shooter incident.
Holliday said there was a previously scheduled active shooter training drill scheduled this week, but that has been cancelled.
Morning reports of a possible active shooter led to the lockdown of Redstone Arsenal Tuesday.
China launches new naval destroyer
The Type 055 will be a central part of future Chinese aircraft carrier battle groups, Li said in the article. The 10,000-tonne vessel is reported to be among the largest warships in the world.
Colster said there are no reported injuries that he is aware of.
The base has called off a drill on how to respond to an active shooter because personnel learned "everything they need" on Tuesday, Holiday said.
The building is used as the missile and aviation command building at the Sparkman Center on the military base.
"The situation we live in in the United States today leads to the need for caution", he said.
But Huntsville hospital officials said they had not heard of any incoming patients, local TV stations reported.
A full base lockdown lasted for about two-and-a-half hours, and some buildings were shut for four-and-a-half hours, Holliday said. "Honestly, if we have to overreact, I would rather overreact than underreact".
That includes Alabama Governor Kay Ivey, who said she would continue to monitor the situation and pray for a peaceful, and quick, resolution.