Russia told the U.S these two guys were suspicious.
the CIA , FBI, KGB and the Nazi Party all investigated them and didn't come up with much, so they did what they had to do, nothing.
This is a classic example of how the media works their magic.
They talk about how outrageous it is that they had forewarning and couldn't prevent anything.
The government CAN'T stop someone from throwing combustibles in a pot and dropping it off on a street.
The purpose of the media propaganda is to get YOU to give the government more illegal authority.
Is all great until the day you wake up on the no-fly list, and you go to clear your name and they say "sorry, our policy is to never remove names, that's what you voted for"