Wells Fargo said soured energy loans soared 49 percent in the last three months of 2015, fueled in part by tumbling oil prices.

Oil-and-gas nonaccrual loans, which includes those that are delinquent or have been written off, totaled $844 million as of Dec. 31, compared with $566 million at the end of the third quarter, the San Francisco-based bank said Wednesday in its annual regulatory filing. The firm had $76 million of nonaccrual energy loans at the end of 2014.

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