A possible active shooter was reported at a U.S. Army installation in Alabama on Tuesday.

The Redstone Arsenal in Huntsville issued the alert on Twitter of a “possible active shooter on the Arsenal.”

Redstone Arsenal spokesperson Christopher Colster said the location of the incident has not been determined though people inside the arsenal said it is in the Sparkman Center.

Colster said there are no reported injuries that he is aware of.

“Installation is on lockdown. Run, hide, fight,” the tweet read.

Rep. Robert Aderholt, R-Ala., said he and his staff are monitoring the situation.

“My staff and I are monitoring situation at Redstone Arsenal. Please join me in praying for the safety of everyone on base,” he said on his Twitter account.

All gates are closed and the public is advised to avoid the area. Employees are being advised to shelter in place.

Redstone Arsenal has more than 40,000 employees spread out over a sprawling 30,000 acre facility. The vast majority of people on the arsenal are civilians with less than 1,500 uniformed personnel.

Redstone Arsenal @TeamREDSTONE

Possible active shooter on the Arsenal. Installation is locked down. Run hide fight.

11:24 AM - 27 Jun 2017

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Sarah Macaluso @SarahMacaluso

Gate 8 at Redstone Arsenal is closed and cars trying to get in are backed up on Patton Rd. @whnt

11:26 AM - 27 Jun 2017

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Rep. Robert Aderholt @Robert_Aderholt

My staff and I are monitoring situation at Redstone Arsenal. Please join me in praying for the safety of everyone on base.

11:46 AM - 27 Jun 2017