If next week something similar were to happen inside the US, you know the media and politicians would immediately point the finger at Russia as retaliation for the attack in Moscow, regardless of who is responsible.
If you think about it, if some Islamic Terrorist group wanted to carry out a similar attack inside the US, what better time to do it and get the blame placed on someone else.
Sure, because that's exactly what happened after the Boston Marathon bombing, when the US/media/politicians pointed the finger at Russia?
Similar to a video game Call of Duty where Russians pretend to be Americans and do a mass shooting of an airport.
This is how things can spin out of control real fast.
Yep, they could time it with all the hulabaloo over the eclipse.