Treasury yields climbed to multiyear highs, intensifying warnings for stock investors as markets assessed the prospect of further Federal Reserve rate increases. The 10-year yield reached 5.12%, its highest level since 2007, while the 30-year yield touched 5.4%, its highest since 2004; the five-year yield also reached a 2007 high. BlackRock chief investment officer of global fixed income Rick Rieder called the move an eye-opener rather than a crisis and said investors should consider its implications. Higher oil prices and stronger-than-expected business activity contributed to the rise in yields, while New York Federal Reserve president John Williams said another increase before year-end was reasonable to consider. Federal Reserve governor Michael Barr made similar comments the previous day. Rates remained elevated the following day.