Morning Chatter

“DC ON ALERT: Outside White House, Pennsylvania Ave again closed to pedestrians.” — NBC News’ Peter Alexander with accompanying photograph. 

CAUTIOUS CORRESPONDENTS: “I don’t want to overly speculate because as you know early reports are often wrong, we could be way off base but clearly they are saying this was an explosive device, an improvised explosive advice, in other words, a bomb.” — CNN’s Wolf Blitzer. “We’ve been careful all afternoon, did not jump to conclusions.”