Yes, ~63 people from a single terrorist group, according to a single report, back in 2015.
DHS obviously has more than one job.
I mean, we're also talking about a place with the 30th busiest airport on the planet, with an international border, and a large international port. Of course the federal law enforcement agency tasked with enforcing laws regarding those activities has an office there.
I have learned to take judgments from DHS about people's intentions with great and well-deserved skepticism. It is common and normal for Muslims to join together in study groups, and we have numerous published examples of FBI coercing people to join and then try to radicalize these groups so that they can be labeled terrorists. Sometimes the FBI even supplied weapons. Most members of any of these groups have no interest in violence, but all get tarred for membership if any do.
It is routine for law enforcement to lie, and to coerce people under their control to lie, to serve whatever narrative their boss somewhere up the line has constructed. It is not exceptional: they consider this their job.
DHS obviously has more than one job.
I mean, we're also talking about a place with the 30th busiest airport on the planet, with an international border, and a large international port. Of course the federal law enforcement agency tasked with enforcing laws regarding those activities has an office there.