Comment: No

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In reply to comment: Listen at 0:56 (see in situ)

No

"AND how do we explain witnesses saying that it was broadcast just before the explosion: Remain calm this is just a drill."

I can find absolutely no one that claims this but you. The link you gave me, the guy says that there were bomb sniffing dogs and a announcement at the START of the race in the athletes village. I bleieve there is at least one other person that confirms what this guy says as well. I am not saying that this didn't happen at the start of the race, I believe that it did. But unless you can prove otherwise, there was no broadcast "just before the explosion" to "remain calm, this is just a drill." You have your facts mixed up.