Updated: The bombers watched the bombs blow people up and then walked away

Just released video of the two bombers watching the bombs go off and then walking away slowly.

http://videocafe.crooksandliars.com/heather/unreleased-footage-shows-boston-bombing-su

Here is another video made earlier in the day when they were searching

http://tv.msnbc.com/2013/04/19/boston-bombing-manhunt-at-large-brother-dead/