Boston Cardinal Sean P. O'Malley joins Boston faith leaders at the Healing Our City interfaith prayer service to honor those affected by the Boston Marathon bombings, held at the Cathedral of the Holy Cross in Boston April 18.&lt;br /&gt;&lt;br /&gt;&lt;br /&gt;&lt;br /&gt;&lt;br /&gt; Pilot photo/ Gregory L. Tracy&lt;br /&gt;&lt;br /&gt;&lt;br /&gt;&lt;br /&gt;&lt;br /&gt; 
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