Video of Explosions at the Boston Marathon 2013
(WHDH via YouTube)
This was no gas line explosion. Look at all those international flags. This was a terror attack and I hope the media does its job on this one.
No flame visible on the video. I’d say that rules out a gas leak.
It'd be nice if news networks wouldn't plaster their logos and titles over half the screen area so we could at least see what's happening.