The island of Anguilla, where the incident occurred, has never been a U.S. Territory. I know it might seem burdensome, but you may want to read the article before posting.
The island of Anguilla
Only at the very end is ‘island’ mentioned.
And not as you clearly stated ‘The island of Anguilla’.
There is, in fact, Anguilla V. I. not too far away.
~160 miles.