Lt. Mike Murphy of the Newton, Mass., fire dept., carries an American flag down the middle of Boylston Street after observing a moment of silence in honor of the victims of the bombing at the Boston Marathon near the race finish line on Monday in Boston, Mass. At 2:50 p.m., exactly one week after the bombings, many bowed their heads and cried at the makeshift memorial on Boylston Street, three blocks from the site of the explosions, where bouquets of flowers, handwritten messages, and used running shoes were piled on the sidewalk. (AP Photo/Robert F. Bukaty)

The nation stopped to remember the tragic events that began a week ago with twin explosions at the finish line of the Boston Marathon as prosecutors charged a suspect in his hospital room with using a weapon of mass destruction in the attack. At precisely 2:50 p.m., bells tolled throughout Boston to mark the moment that the first explosion tore through the city’s heart, killing three and injuring more than 200 -- an updated figure on the wounded. President Obama, who visited Boston last week to participate in an interfaith service, commemorated the tragedy by pausing in Washington. Trading was halted on the New York Stock Exchange/Michael Muskal and Michaeal A. Memoli, Los Angeles Times. More here.

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