We’re seeing the same early reports from media outlets noting a massive police presence at the Washington Navy Yard in Building 197, the “gun free zone” that was the site of a deadly 2013 mass shooting.

An hour after the initial alarm, we can state the following:

• The Washington Navy Yard is in lockdown
• There are no confirmed casualties
• There are no reports of shots fired by anyone inside Building 197
• There have been no confirmed sightings of anyone with a firearm, other than responding ERT units
• SWAT/ERT has reportedly cleared floors 1-5 and continues to work their way up the building floor-by-floor, evacuating employees

This is beginning to look like a false alarm.

We’ll update this story as confirmed information comes out, or you can follow me in real-time on Twitter.

The lockdown is over after the building was cleared and all staff were accounted for by authorities. The incident at the Navy Yard was a false alarm, spurred by an individual employee who called 911 because of a loud noise.