Do they all look like the pirates in Captain Phillips? If so, they should be really easy to spot.
yes, they all had eyepatches, cutlasses, tri-cornered hats and were yelling "arrh, avast matey."
Actually, Somalis look different from American blacks. Go to the Twin Cities some time....preferably during the summer. When I was attending the Minn. State Fair a few years ago I was surprised to see many groups of them standing on street corners near the MOA. They're not hard to spot.