Bombs Hit Three Argentine Bank Branches, One Dead &lt;p&gt;&lt;/p&gt;&lt;p&gt; By Mary Milliken&lt;/p&gt;&lt;p&gt; BUENOS AIRES, Argentina (Reuters) - Bombs exploded at threebanks in the Argentine capital on Wednesday, including twobranches of U.S. giant Citibank, killing one security guard andinjuring a bomb squad officer, officials said.&lt;/p&gt;