To many oddities for it to be coordinated and organized, IMO. The vidoe of both explosions look to be fairly low yield, small plume, blast wave didn't seem overly powrful. Not a lot of frag either or the body count would have been exponentially higher. People approx 30-40 ft away were barely effected. Suitcase or smaller device, no additional frag, maybe some glass. Why set it off three hours after the winners passed, after most of the TV crews were packing up and or gone? Hit it when the first group come in and it's WELL covered as opposed to one or two outlets and cell cameras. I'd ALMOST say specific target, but why multiple devices and timed differently? If you're setting off multiples, set the first and wait until all the first responders get on scene to set the second, increased panic. Not very sophisticated if they weren't detonated together, and the third+ device didn't go at all.