The yield on 10-year Treasuries – the benchmark price of global capital – surged 30 basis points in just two days last week to over 3.9pc, the highest level since the Lehman crisis. Alan Greenspan, ex-head of the US Federal Reserve, said the abrupt move may be "the canary in the coal mine", a warning to Washington that it can no longer borrow with impunity.


...the yield spike recalls the move in the spring of 2007 just as the credit system started to unravel.
Sell-off in US Treasuries raises sovereign debt fears - Telegraph