U.S. muni bond prices plunge after market open

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PIMCO INTERMEDIATE MUNICIPAL BOND EXCHANGE-TRADED FUND (NYSE: MUNI) Delayed: 51.80 +0.12 (0.23%)
Previous Close $51.68    52 Week High $55.48 
Open $51.80    52 Week Low $52.65 
Day High $51.83    P/E N/A 
Day Low $51.76    EPS $0.00 
Volume 358,501