Oct 29 (Reuters) - A UPS (UPS.N) plane at Newark Liberty International Airport in New Jersey that was searched for suspicious packages from Yemen has been cleared, a Port Authority of New York and New Jersey official said on Friday. U.S. authorities were investigating cargo planes arriving in the United States that were carrying packages from Yemen after suspicious packages were found at an airport north of London and at a cargo facility in Dubai. (Reporting by Michelle Nichols, editing by Doina Chiacu)