Also it’s my understanding the number of fatalities, or size of the bomb isn’t important to them...as long as whatever it is gets the press. So location in a crowd is sough
That is a key difference between an international terrorist and our homegrown mass shooter types.
The homegrown sort wants to outdo the body count of the one before him.
Unless of course they are ‘recruited’ to pull it off. Which I understand the Terrorist now look for Americans to do the work, often thru the prison system who can reveal contacts etc.....usually have poor family relations, often with at least a minor police record.
So even if home grown......I tend to think they'll be some pretty dark, murky creatures lurking behind the scenes in this case.