Update 2 p.m.: Newbold says the "shelter" order has been lifted.
There are several reports out right now of shots fired outside the U.S. Capitol building in Washington, D.C. One of the first to confirm this was Senator Claire McCaskill, who tweeted that her office is on lockdown.
We were able to reach Andy Newbold in McCaskill's office who confirms they've been on lockdown for the past twenty minutes or so.
"We're being told to shelter in place," he says. "Close and lock doors, stay away from windows and wait."
Here's McCaskill's original tweet:
Shots fired outside the Capitol. We are in temporary lock down.— Claire McCaskill (@clairecmc) October 3, 2013
Newbold also told us that although McCaskill is not with him in her office -- she was attending a meeting with other senators at the time the lockdown went into effect -- she is "probably safer than anyone on the planet right now."
Details are scant at this time -- we'll update as the situation progresses.