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April 20, 2013
Matt Rourke photo

FILE - In this Wednesday, April 17, 2013 file photo, a mourner reacts during a candlelight vigil at City Hall in Cambridge, Mass. in the aftermath of Monday’s Boston Marathon explosions. Event after nail-biting event, America was rocked this week, in rare and frightening ways, with what felt like an unremitting series of tragedies.

David Ryan photo

FILE - In this Monday, April 15, 2013 file photo, people react as an explosion goes off near the finish line of the 2013 Boston Marathon in Boston. Event after nail-biting event, America was rocked this week, in rare and frightening ways, with what felt like an unremitting series of tragedies.

Lm Otero photo

FILE - In this Thursday, April 18, 2013 file photo, emergency personnel search the rubble of an apartment destroyed by an explosion at a fertilizer plant in West, Texas. Event after nail-biting event, America was rocked this week, in rare and frightening ways, with what felt like an unremitting series of tragedies.

Carolyn Kaster photo

FILE - In this Wednesday, April 17, 2013 file photo, President Barack Obama hugs Nicole Hockley, mother of Dylan, who was killed in the Newtown School shootings, during a news conference in the Rose Garden of the White House in Washington. The Senate voted down legislation that would have banned assault weapons and expanded background checks of gun buyers. Accompanying the president are former Rep. Gabby Giffords, second from left, Vice President Joe Biden, and other Newtown family members from left, Neil Heslin, father of Jesse Lewis; Jimmy Greene, father of Ana; Mark and Jackie Barden, with their children Natalie and James, who lost Daniel; and Jeremy Richman, father of Avielle, behind the Bardens.