With three people dead and many injured, Boston is still reeling from the horrific twin explosion.
The finishing line of the marathon is streaked with blood and a mess of broken glasses from yesterday’s explosion. Many still grief over the disaster as the hunt for suspects and motives behind the grisly attacks remained "wide open", said US investigators.
Two police officers walk down Boylston Street, away from the finish line of the Boston Marathon in Boston, Massachusetts April 16, 2013. Two bombs packed with ball bearings tore through crowds near the finish of the Boston Marathon, killing three people and triggering a massive hunt for those behind an attack the White House said would be treated as "an act of terror".