Female terrorist.

If I were that guy and I didn't do it, my ass would be at the police station right the **** now.

I'm not a great expert on body language but its something to look at. The dominant male has his arm over his biceps and then later on they are behind his back in a more relaxed/ submissive manner. The oh ****, I ****ed up position.

Dude is never even looking at the finishing line. Everyone's facing one way, and he's completely uninterested.

No, there's not. His arms are folded. Look at the 3rd picture I posted a page back. (the very big one with them circled at the bottom.) He is NOT holding the backpack. Edit, even easier, just look at the picture above this post. :doh!:

Devil's advocate, he could just have the backpack at his feet, wanting to rest his shoulders.

Yeah I was just noticing that in Stanley Nickel's post. Maybe he set it down? You can't say definitively he doesn't still have it but it all looks damn suspicious. His sidekick kinda has that "angry at the world" look to him as well.

gymbag of peace

http://imgur.com/a/sUrnA/noscript

More suspects

Sure. Do you usually set your backpack down at your feet in the middle of a crowd as dense as this? And besides, you can see that they have moved several feet in the last two pictures. Look at the guy behind them with the yellow green and red stripes on his jacket sleeves. He starts out above and on their right. In the last shot, he is above and to the left. They were walking.

Wonder if two got support from three who originally reside near Yemen...Just speculating

My brain is going to melt after looking at the photos on that link.

Guy in blue moves far away from the blast and still has his backpack. Just a creepy looking dude. The guy with the Khaki pants is security of some sort. He is shown with his partner in later pictures clearly involved in security.

No shit. I don't even know what 3/4 of them meant.