Initial tests of package in Britain not a bomb - FBI

NEW YORK (Reuters) - A suspicious package found on a UPS plane stopped in Britain was initially tested and found not to contain explosives, an FBI source said on Friday.

U.S. authorities were investigating "potentially suspicious items" on Friday on cargo planes that landed at airports in Newark, New Jersey, and Philadelphia, the Transportation Security Administration said.

(Reporting by Christine Kearney, editing by Doina Chiacu)