Boston Police said Friday they had found a vehicle they say may have been used by a 19-year-old suspect in the Boston Marathon bombings.
"UPDATE: Vehicle (MA Plate: 316-ES9) found unoccupied. Car being processed for evidence by authorities," police posted on the department Twitter feed.
Earlier, police posted: "#WANTED: Police seeking MA Plate: 316-ES9, '99 Honda CR-V, Color - Gray. Possible suspect car. Do not approach."
Police said Dzhokar Tsarnaev and his brother, 26-year-old Tamerlan Tsarnaev, who came to the Boston area from Chechnya several years ago -- are the suspects in the Monday bombings near the Boston Marathon finish line, killing three people and wounding more than 170.
Also posted on Twitter was a vow of revenge by Dzhokhar Tsarnaev, 19, although the Twitter page with his picture and tweets written in Cyrillic apparently was a hoax.
Dzhokhar Tsarnaev apparently had a profile on the social network vKontakte, an alternative to Facebook in Russia, The Boston Globe reported.
The profile, apparently from early 2012, indicates a user last logged in Thursday. While the profile appears to be genuine, it has not been verified, the Globe said.
Other profiles purporting to be Tsarnaev's have popped up on Twitter and Facebook.
Video footage showed heavy activity by police and federal agents on the ground and in the air in Watertown. SWAT forces lined nearby rooftops.
President Obama has been briefed on the situation in Boston throughout the night and day.
The Boston Globe said it was told by a law enforcement source an explosive trigger was found on Tamerlan Tsarnaev's body at the morgue. It had been reported he had explosives on his body when he was killed.
Boston and its suburbs were in virtual lockdown Friday as officers searched for Dzhokhar Tsarnaev. Suspended was transit and Amtrak service. Taxi service, which was initially suspended, was restored late morning. Colleges and universities canceled classes. Residents were told to stay indoors and businesses were told not to open.
The Federal Aviation Administration temporarily suspended air travel in and out of Boston.
The Boston Bruins canceled its morning skate.
A Massachusetts Institute of Technology police officer was killed and Boston area transit police officer Richard H. Donahue Jr. was critically wounded when the brothers carjacked a vehicle.
Ten officers were being evaluated at St. Elizabeth's Medical Center in Brighton for injuries sustained from grenades thrown from the window of a car during a chase, the Globe said. No further information was available.
CNN said when the brothers stole the vehicle, they told the driver they were the Boston Marathon bombers. The driver was released.
Tamerlan Tsarnaev, who was wearing a black hat in photos released by the FBI Thursday evening, is dead after firing bullets and launching explosives at police.
"I'm wordless. I am wordless," the suspects' uncle, Rouslan Tsarnaev, told WBZ-TV, Boston.
Rouslan Tsarnaev, who lives in Maryland, said the brothers came to the United States when they were children in 2000 or 2001. He described Dzhokhar Tsarnaev as a "nice, quiet boy" who was attending college but described his brother as a "loser" who was out of school.
"I'm not sure what he was doing," the uncle said in reference to Tamerlan Tsarnaev.
The men's father returned to Russia last year, a friend interviewed by WBZ said.
WBZ reported the youths were permanent U.S. residents. Tamerlan Tsarnaev reportedly was a competitive boxer and his brother was on the wrestling team in high school.
"It was like a bomb blew up in my heart this morning," Dzhokhar Tsarnaev's wrestling coach told WBZ.
Neighbors living near the younger brother's apartment on Norfolk Street in Cambridge described him as strange but said they could not articulate what made them say that, WBZ reported.
ABC News reported police said they believed the surviving suspect has assault rifles and other weapons, possibly including bombs.
"This is a serious situation. We're taking it seriously," Gov. Deval Patrick said at an 8 a.m. media briefing in Watertown.
"We've had a very rapidly developing situation," Patrick said. "We're asking people to shelter in place ... and not to open the door [except] for ... law enforcement. ... We're asking public to take it seriously and follow these simple instructions."
Boston Police Commissioner Ed Davis also was telling people to shelter in place.
Authorities told NBC News the brothers had international ties.
Both had paramilitary experience, officials said. ABC News said they were possibly trained in Turkey.
Massachusetts Bay Transportation Authority Police Capt. Paul MacMillan said the suspect was killed in a gunfight, CNN reported.
A letter posted on the MIT website from Israel Ruiz, the school's executive vice president and treasurer, and Chancellor Eric Grimson, read:
"MIT suffered a tragedy last night: an MIT police officer was shot and killed on our campus in the line of duty. While the circumstances around the officer's death remain the subject of an active investigation, what is certain is that the officer gave his life to defend the peace of our campus. His sacrifice will never be forgotten by the Institute. ..."
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