An Iraqi actor who stars in "United 93," Paul Greengrass's new film about one of the planes hijacked on September 11, has been refused entry into the US for the movie's premiere. UK-based Lewis Alsamari has been told he will not get a visa for this week's screening at the Tribeca Film Festival. The actor, who plays the lead hijacker on board United Airlines flight 93, has not been given a reason by the US embassy in London. The Guardian reports.