April 7 (Reuters) - A shortage of West Coast port workers has forced the busiest U.S. ocean trade gateway to shut on Friday, after months of strained labor negotiations between the dock workers union and their employers.
"The action by the union has effectively shut down the ports of Los Angeles and Long Beach," the PMA said in a statement.
Port of Los Angeles officials were communicating with the ILWU and PMA, along with federal, state and local officials, to "support a return to normal operations," said the group, which is managed by a unit of the City of Los Angeles.
A representative of the ILWU Local 13, which represents workers at both the Los Angeles and Long Beach ports, declined to comment.
Reporting by Laila Kearney in New York; editing by Diane CraftOur Standards: The Thomson Reuters Trust Principles.