ICE is running a roadblock on I93, south.

I drove thru Friday afternoon.  It was around Ashland. Not sure what they were looking for, they didn't even ask me my name, just waved me thru.  I assume a four door Buick sedan, with New Hampshire plates, no bumper stickers, just me in the car, looked innocent enough.  I wonder what would have looked suspicious enough to pull over.  ICE was still at it the next day when I drove home.  I understand that ICE has authority to run roadblocks as much as 100 miles inside the US border.  This one was pretty close to 100 miles from Canada.  ICE has done this before, couple of years ago I hit an ICE roadblock at about the same place.