Nortel Says Canada Plans Accounting Probe  SAN FRANCISCO (Reuters) - Nortel Networks Corp.  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=NT.N target=/stocks/quickinfo/fullquote"&gt;NT.N&lt;/A&gt;  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=NT.TO target=/stocks/quickinfo/fullquote"&gt;NT.TO&lt;/A&gt; said on Monday the Royal Canadian Mounted Police told  the company it will begin a criminal investigation into  Nortel's financial accounting.