Two Boston Marathon Bombers, Brothers from Chechnya, Russia - 1 Confirmed Dead - 1 On the Loose - 1 Cop Shot & Killed - 1 Cop Shot & Wounded

• BREAKING NEWS: Multiple Explosions Heard as Boston Police Surround Home in Bombing Manhunt

  Police surround house in Watertown, Mass., in hunt for remaining Boston Marathon bombing suspect who was identified as Dzhokhar A. Tsarnaev, 19, pictured, and believed to be brother of the other bombing suspect, Tamerlan Tsarnaev 26, who was killed early Friday morning in a shootout with police.
• VIDEOS: Suspect on Loose ID'd  | Explosives Litter Streets of Boston Suburb  | Suspect Dead at Hospital 
• Witness Describes Police Activity  | Bomb Probe a Game Changer  | PHOTOS: Cops Swarm Boston Suburb 
• PHOTOS: FBI Releases Suspects' Photos  | WARNING GRAPHIC IMAGES: Twin Blasts Rock Boston