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Police officers take position during a search for the Boston Marathon bombing suspects in Watertown, Massachusetts April 19, 2013.  Police on Friday killed one suspect in the Boston Marathon bombing during a shootout and mounted a house-to-house search for a second man in the suburb of Watertown after a bloody night of shooting and explosions in the city's streets.    REUTERS/Brian Snyder    (UNITED STATES - Tags: CRIME LAW ANIMALS TPX IMAGES OF THE DAY) - RTXYS3T
A door-to-door search is underway in Watertown, Massachusetts following a long night of violence that left 26-year-old Tamerlan Tsarnaev, also known as suspect one in the black hat, dead, and his 19-year-old brother Dzokhar, suspect two in the white hat, on the run. Boston is at a standstill with residents told to stay in their homes and transit systems shut down and a no-fly zone issued for Watertown.

Police reportedly have an idea of where Dzokhar is, but obviously given that Tamerlan had an IED strapped to him, they will approach him with caution.

MSNBC reports that two people have been taken into custody at the home where the brothers lived, the location where CNN had previously reported what appeared to be a major police action.

5:56 AM PT (Jed Lewison): If you're looking for live video streams, here's NBC, ABC, and Boston's local CBS affiliate.


6:03 AM PT (Jed Lewison): Mother Jones' Adam Serwer says he's found a YouTube page of the dead bombing suspect.

The deceased suspect in the bombing of the Boston marathon, which killed three and injured more than 170, appears to have posted a video extolling an extremist religious prophecy associated with Al Qaeda to his YouTube page.
6:04 AM PT (Jed Lewison):
Meninon press sec -> RT @johnguilfoil Please DO NOT Tweet photos of police in tactical positions.
@Travis_Waldron via web

6:06 AM PT (Jed Lewison): NBC's Pete Williams says the concern about other suspects, including family members, is fading: the Dzokhar Tsarnaev, the "white-capped suspect" is the primary focus of concern.

6:12 AM PT (Jed Lewison): A high school classmate of Dzokhar Tsarnaev says she is shocked to learn he was behind the marathon bombing. Also an interesting note: she says she recognized him immediately, but because she believed the suspect had already been identified as missing Brown student Sunil Tripathi, she assumed the resemblance was a coincidence and went back to sleep. It's a side note, but a powerful lesson in how the brain can be conditioned to process information—and the dangers of leaping to conclusions.

6:35 AM PT (Jed Lewison):
Just spoke to two Transit police officers who told me that their colleague who was shot is "going to live" and is "a good, brave dude."
@davabel via Twitter for iPhone

7:01 AM PT: New thread.

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