Morning Maddow: April 19

Updated
 
Huge developments overnight in the Boston Marathon bombing investigation: one suspect is dead, the other is still at large and considered very dangerous
His name is reportedly Dzhokhar A. Tsarnaev, 19
One MIT police officer killed in the manhunt
You can hear several minutes of gunfire in this video
Residents in six Boston-area cities are asked to stay indoors, businesses closed
NBC News’ Pete Williams: the suspects are brothers, from Chechnya 
You can listen to the Boston police scanner here and the Cambridge police scanner here

Rachel Maddow Show Morning Maddow

Morning Maddow: April 19

Updated