Omar Artan may be one of Africa’s top soccer referees —but he won’t be officiating in the upcoming FIFA World Cup after U.S. immigration authorities denied him entry into the country, citing “vetting concerns” that rendered him “inadmissible.” Customs and Border Protection said in a statement Monday that a Somali World Cup referee arrived at Miami International Airport from Istanbul, Turkey, on June 6, and was barred from entry following additional “routine” inspection. The statement did not