WASHINGTON (Reuters) - Federal prosecutors are pursuing criminal cases against executives from the Royal Bank of Scotland Group (>> Royal Bank of Scotland Group plc) and JPMorgan Chase & Co (>> JPMorgan Chase & Co.) for allegedly selling flawed mortgage securities, the Wall Street Journal reported on Tuesday, citing unnamed sources.

People familiar with the probes said officials were trying to determine whether the bankers ignored warnings from associates that they were packing too many weak mortgages into investment offerings and whether they can prove that constituted fraud, the newspaper said.

(Reporting by Timothy Ahmann; Editing by Jeffrey Benkoe)

Stocks treated in this article : JPMorgan Chase & Co., Royal Bank of Scotland Group plc