China share trading halted after market plunges 7% in opening minutes

'Circuit breaker' mechanism deployed to protect economy for second time in a week as China sparks jitters by speeding up devaluation of yuan China halted the day's trading within 30 minutes of opening on Thursday morning as shares plunged by more than 7% - triggering an automatic "circuit breaker" - and authorities accelerated the devaluation of the Chinese yuan. China's recently installed "circuit breaker" mechanism paused trading for 15 minutes after the CSI300 index fell 5% in the first 13 mi...