Correction: Mark Knoller has noted that Obama has just gotten back to the White House from being at Tomb of Unknown Soldier when the incident happened:
Watch as @POTUS lays a wreath at the Tomb of the Unknown Soldier: https://t.co/fXU6ozGL8E #MemorialDay2016 https://t.co/NeknQ6zV22
— The White House (@WhiteHouse) May 30, 2016
Update:
Suspect threw a container over the fence.
