Three legal immigrants in a cargo truck were detained at the Port of Miami after a routine inspection raised concerns, but police say the incident may have stemmed in part from a language barrier. The port's cargo area was shut down Sunday as the Miami-Dade bomb squad X-rayed the truck and scanned it for radioactive materials. Nothing unusual was found, officials said. The men in the truck - two Iraqis and one Lebanese national - were still detained by local police Sunday evening, but authorities said no federal charges were expected. Officials initially said the men, all permanent US residents, had been caught trying to slip past a checkpoint at the port's entrance.