It could br pellets scattered around without any explosion. In fact, considering the cold blooded way they are going about killing our citizens, I would expect it to be done that way. Makes sense why Gorbachev wouldn't come here. He has to figure his chances of being hit by an explosion are pretty slim. But a hidden killer sending out deadly radiation. That' my take.
Fuqing A, pay back for all of this is going to be a B%tch.