Oil Charges Over \$50 on Nigeria Threat &lt;p&gt;\&lt;/p&gt;&lt;p&gt; By Andrew MItchell&lt;/p&gt;&lt;p&gt; LONDON (Reuters) - Oil prices raced to new record highs\above \$50 on Tuesday as rebel threats against Nigerian oil\facilities threatened to inflict further strain on global\supplies.&lt;/p&gt;