WASHINGTON, Oct 15 (Reuters) - The U.S. Federal

Communications Commission said on Wednesday it is moving to

revoke the authority of Hong Kong telecom carrier HKT

International to operate in the United States, citing national

security concerns.

The U.S. telecom regulator issued a show cause order

directing HKT and its subsidiaries to explain why the FCC should

not commence revocation proceedings, citing its affiliation with

China Unicom Americas.

The FCC previously voted to revoke the authorization for

China Unicom and other Chinese telecom carriers to operate in

the United States.