Editor’s note: This post has been updated as new information becomes available. 

Breaking news out of London where we’re seeing reports that a man has been shot by police outside of parliament in London:

According to eyewitness Charlie Cooper of Politico, the man “appeared to be wielding a knife”:

Update: “At least two casualties.”

Update 2. There are reports that these same attackers mowed down civilians on Westminster Bridge:

Update 3:

Update 4: Reports of “as many as a dozen” injured and that a police officer was stabbed:

Update 5. An eyewitness to the shooting talks to Sky News:

Update 6. Scene at Westminster Bridge:

Update 7. Graphic image warning:

Update 8. Authorities are now calling the attack terrorism: