Scenes from Boston bombing manhunt
A look at the past 24 hours.
STFAmtrak trains sit idle in a train yard on the south side of Boston Friday, April 18, 2013 as all transit service remains shut down in the Boston area. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during their getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Elise Amendola)