<sod >A dramatic sell-off in US stock markets has spread across the world, triggered by a sharp rise in US bond yields after data last week showed wages increasing at the fastest pace since 2009.< eod>< sod > A dramatic sell-off in US stock markets spread across the world on Tuesday,Â triggered by a sharp rise in US bond yields after data late last week showed wages increasing at the fastest pace since 2009.< eod>