In the face of ongoing muni weakness and the approaching federal income tax deadline, municipal bond mutual funds that report their flows weekly saw losses rise significantly as $1.14 billion left the $462.10 billion industry in the week ended April 6, according to ­Lipper FMI.

Tax-exempt yields backed up slightly Friday as the muni market followed weakness in Treasuries and the 10-year muni yield hit 3.25%, its highest level since Feb. 15.

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