ARMS FOR HANOI BLOCKED BY CHINA, U.S. AIDES REPORT; Last Train of Soviet Supplies Is Said to Have Reached Destination on June 14 REASONS ARE NOT CLEAR Disorders of Red Guards or Displeasure Over the Paris Talks May Be Factors ARMS FOR HANOI REPORTED GURBED
some US Govt analysts see interruption in flow of mil supplies by rail through China as way for China to discipline N Vietnam for participating in talks