WASHINGTON (Reuters) - The U.S. credit union regulator filed lawsuits on Monday against JPMorgan Chase & Co's JPMorgan Securities and Royal Bank of Scotland Group Plc's RBS Securities, alleging misrepresentation of investment vehicles backed by mortgages. (http://feeds.feedburner.com/~ff/reuters/topNews?d=yIl2AUoC8zA) (http://feeds.feedburner.com/~ff/reuters/topNews?i=IjQDDkiEA_4:YpAL4D2QH0Y:V_sGLiPBpWU) (http://feeds.feedburner.com/~ff/reuters/topNews?i=IjQDDkiEA_4:YpAL4D2QH0Y:-BTjWOF_DHI) (http://feeds.feedburner.com/~r/reuters/topNews/~4/IjQDDkiEA_4)