The yield on German two-, five-, 10-, and 30-year bonds fell to record lows.
The yield on the 10-year securities fell as much as four basis points to 1.628 percent and was at 1.632 percent at 12:03 p.m. London time.
Two-year yields reached 0.074 percent, five-year yields touched 0.578 percent and 30-year yields slid to as low as 2.331 percent.
Bund futures rose to an all-time high of 141.53.
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