UPDATE 3: Buzzfeed has found Dzhokhar Tsarnaev's actual twitter account. Some screenshots from the google cached version:
Two days after the bombing:
And one day after the bombing:
UPDATE 2: From the Guardian:
An uncle of the suspects, Ruslan Tsarni, has given a TV interview calling on his nephew Dzhokhar Tsarnaev to "Turn yourself in, that's what I would say" and ask for forgiveness.
He says the two brothers are in danger of giving all Chechens, "the entire ethnicity," a bad name and that Dzhokhar must turn himself in.
"These are two individuals" and do not represent the entire Chechen people, Tsari says.
He closes by saying he would ask the family of victims for forgiveness.
"I dearly ask you to respect our property. With the families of those who suffered, we're sharing with them their grief. And ready to meet with them, just to bend in front of them to ask their forgiveness."
UPDATE 1: Confirmed dead suspect named 26 year old Ruslan Tsarni.
From the BBC:
People across Boston and surrounding suburbs have been told to stay indoors amid a massive police manhunt for one of two brothers suspected of carrying out the Boston Marathon bombings.
Police are hunting Dzhokhar Tsarnaev, 19, after he escaped a shoot-out where another suspect, his brother, died.
"Stay indoors with the doors locked," the Massachusetts governor said.
Three people died and more than 170 were hurt when two bombs exploded near the finish line of Monday's marathon.
The FBI has released several images of the suspects
The FBI released several images of two men they were hunting in relation to the bombing, one wearing a white cap, the other a black cap.
Police said "suspect number one" had been killed early on Friday, and they were looking for "suspect number two", the "white-capped individual", later named as Dzhokhar Tsarnaev.
Reports said the black-capped suspect - widely named in the US media as Tamerlan Tsarnaev - was the fugitive's elder brother.
Both are said to be of Chechen origin, and are reported to have moved to the United States about 10 years ago.