Updated, 2:50 pm EST: Shooter reportedly in custody [embedtweet id="385837735535050752"]
Early reports suggest a possible gunfire incident may have taken place Thursday on Capitol Hill. CNN reports that "police are reacting to reports of shots fired on Capitol Hill in Washington. CNN's Ted Barrett reports an order was given over the Capitol speaker system to shelter in place because of an active shooter situation."
Meanwhile tweets from Capitol Hill reporters give some further details: