They have for decades.
Hancock, NY is known to be one such place.
There was a group called “The Portland Seven” back around 9/11. I was just reading that their leader was sentenced to 18 years back in 2002. So presumably he (and the others?) are now out of prison. I did not see any recent articles about him (released, died in prison, etc.)
He talked about how he wanted to attack and kill hundreds at a time, but not in a suicide bombing as he wanted to see the results. They discovered the cell as they were practicing shooting at a gravel pit - while wearing their Muslim robes and head wraps!