Night of mayhem sees one suspect killed, a campus police officer slain, a transport officer shot, a robbery and a hijacking - and after a manhunt that shut down most of Boston, the arrest of the second suspect.
UPDATE: The second suspect in the Boston Marathon bombings, Dzhokhar Tsarnaev (19) has been taken into custody.
The Chechen was cornered while hiding in boat behind a house in the Boston suburb of Waterview, Boston police commissioner, Edward Davis, said at a news conference Friday night local time.
“A man had gone out of his house after being inside the house all day, abiding by our request to stay inside,” Mr. Davis said, “He walked outside and saw blood on a boat in the backyard. He then opened the tarp on the top of the boat, and he looked in and saw a man covered with blood. He retreated and called us."
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EARLIER: One suspect in the Boston Marathon bombings has been killed in a shootout with police overnight, but the second suspect is still on the run - paralyzing an areas of Boston with around 1 million people as authorities warn people to stay locked in doors. All public transport is suspended.
The two suspects have been identified as brothers Tamerlan Tsarnaev (26) and Dzhokhar Tsarnaev (19) - Chechens who immigrated to the US a decade ago.
The older brother was shot in a firefight after authorities say the men hurled explosives at pursing officers during a car chase. They are alleged to have killed an Massachusetts Institute of Technology (MIT) police officer, shot a transportation officer, robbed a convenience store and hijacking a car.
The younger brother escaped the shootout, but is believed to be wounded.
Some reports say older brother Tamaerlan Tsarnaev was wearing a home-made explosive device when he was shot.
A motive for the bombings is not immediately clear.
CNN reports that on Wednesday, two days after the bombings, Dzhokar Tsarnaev apparently tweeted, "I'm a stress free kind of guy." Early Tuesday, he tweeted, "There are people that know the truth but stay silent & there are people that speak the truth but we don't hear them cuz they're the minority."
Factions in Islamic Chechyna gave sought independence from neighbouring Russia, at times sparking military action and violent incidents such as the Beslan school hostage crisis in Russia in 2004 that left 330 dead.
But so far there is nothing to tie the two brothers, or their alleged role in the Boston Marathon bombings, to Chechen rebels.
Tamerlan Tsarnaev spent the first six months of 2012 in Russia. Law enforcement authorities are now trying to find out the reason for his trip.
