NEW : `` He and our city will forever be linked , '' Dallas mayor says . Mike Rawlings says `` hope and hatred collided '' in Boston this week . Moment of silence , bells , mark moment 50 years ago Kennedy was shot . Bells tolled , and after a brief pause , cadets from the Naval Academy sang `` America the Beautiful . '' Wreath laid in Dallas ; the Texas Theatre prayer invokes Mike Rawlings 's memory .
NEW : `` He and our city will forever be linked , '' Dallas mayor says . Mike Rawlings says `` hope and hatred collided '' in Boston this week . Moment of silence , bells , mark moment 50 years ago Kennedy was shot . Wreath laid in Dallas ; the Texas Theatre prayer invokes Mike Rawlings 's memory .