President Barack Obama was briefed on the explosions by Homeland Security adviser Lisa Monaco. Obama also told Boston Mayor Tom Menino and Gov. Deval Patrick that his administration would provide whatever support was needed, the White House said. 展开全文
Two bombs exploded near the crowded finish line of the Boston Marathon on Monday, killing three people and injuring more than 141 in a terrifying scene of broken glass, smoke and severed limbs at the world's oldest and most prestigious race, authorities said.展开全文
