WATERTOWN, MA (RNN) – Officials reported they have not apprehended one of the Boston Marathon bombing suspects but are progressing in their search of an area police closed to the public.Massachusetts State Police Col. Timothy Alben said in a 12:30 p.m. ET news conference that a controlled explosion could be expected soon at a house they secured on Norfolk Street in Cambridge. The address for the suspect, 19-year-old Dzhokhar A. Tsarnaev, also was listed as Norfolk Street.
Alben said the door-to-door search of the cordoned off area was about 60 to 70 percent complete. Secret Service agents are at the site along with local and state authorities.
Officials fear Tsarnaev may be wearing an explosive vest, according to the Boston Globe. CNN reported police found homemade explosives during searches Friday.
A vehicle Tsarnaev may have been driving has been found abandoned, and authorities believe he may be on foot.
Early Friday, officials shut down the entire city of Boston and multiple surrounding towns while they look for the surviving suspect in the marathon bombings.
City and state officials announced the unprecedented lockdown in an 8 a.m. ET news conference.
“It may take hours to do this,” Alben said. “Please bear with us.”
One bombing suspect dead
Gov. Deval Patrick said a second suspect, identified by a family member as Tamerlan Tsarnaev, 26, was killed in an overnight shootout with police.
The two were brothers and legal residents originally from a Russian region near Chechnya. Their uncle, Ruslan Tsarni, urged his nephew to turn himself in.
“Ask for forgiveness from the victims, from the injured and from those who loved them,” Tsarni said outside his home in Montgomery County, MD.
Alvi Tsarni, another uncle to the suspects, told WBZ they have been in the U.S. since 2000 or 2001.
“It’s crazy; it’s not possible,” said Tsarni of the suspected actions. “When I saw this on TV news, I said, ‘Who can do this stuff?’”
The younger brother was on scholarship at UMass-Dartmouth, which was shut down for the day. CNN reported he moved to the U.S. with family at the age of 9 and became a naturalized citizen less than eight months ago, on Sept. 11.
Former high school classmates talked about Dzhokhar Tsarnaev as a seemingly normal teen who went to parties and was captain of the wrestling team. However, many of the friends said they hadn’t spoken to him in a year or more.
Tamerlan Tsarnaev was a former Golden Gloves boxer who hoped to make the Olympics team. He was studying to become an engineer at Bunker Hill Community College.
The search has been focused primarily in Watertown, MA, and Alben said their No. 1 priority was neighborhoods in the town. Patrick said people in Cambridge, Waltham, Newton and Belmont have also been told to stay in their homes.
The manhunt went on through the night, and MIT police officer Sean Collier, 26, of Somerville was killed, according to the Boston Globe.
A Massachusetts Bay Transit Authority officer identified as 33-year-old Richard Donohue Jr. was also shot. He was listed in serious condition at Mount Auburn Hospital.
Tamerlan Tsarnaev, the man pictured in a black cap in images released from the marathon, may have been killed by explosives he had in his possession. CNN reported authorities are concerned Dzhokhar Tsarnaev also may have explosive devices.
Thousands of police and other law enforcement have been going door to door looking for Dzhokhar Tsarnaev, pictured wearing a white hat in FBI photos.
Officials have not allowed traffic in or out of Watertown and asked area businesses not to open Friday. Harvard, MIT, Boston College, Boston University and Emerson also canceled classes for the day.
Previously known as suspect No. 1, Tamerlan Tsarnaev was taken to Beth Israel Hospital – the same place 12 bombing victims are being treated – where he was pronounced dead at 1:35 a.m. ET.
Doctors held a brief news conference about the patient, who was in cardiac arrest before he arrived at the hospital.
“He had multiple injuries – blast and multiple gunshot wounds,” Dr. David Schoenfeld said.
Schoenfeld refused to comment on the cause of death.
“[The] patient did suffer significant trauma,” he said.
Chaos, gunfight, explosions
Two men police believed were the bombing suspects carjacked a man in Cambridge and fled, according to a statement from the Middlesex County district attorney.
Police began to pursue the two suspects, who threw explosives and fired on police as they drove from Cambridge into Watertown.
A man in his 20s who was thought to be a suspect but later cleared and released was ordered to strip naked, according to CNN. Officials were concerned he had explosives on his body.
Law enforcement officials consider Dzhokhar Tsarnaev armed and extremely dangerous.
“We believe this to be a terrorist. We believe this to be a man who came here to kill people,” Boston Police Commissioner Ed Davis said in a news conference.
An alert was sent to MIT students reporting shots fired near the Cambridge campus Thursday night. Students were told to stay inside.
About 11,000 people attend MIT. Cambridge is three miles from Boston.
The suspects are the same men who the FBI believes planted two bombs at the finish line of the Boston Marathon on Monday.
The back-to-back explosions killed three people and injured more than 180. Many of the victims underwent amputations.
Those killed include 8-year-old Martin Richard. The boy’s 6-year-old sister lost a leg in the attack, and his mother suffered a brain injury.
Krystle M. Campbell, 29, from Medford, MA, and Lu Lingzi, a 23-year-old graduate student at Boston University, were also killed.
The Bruins and the Red Sox had games scheduled Friday, but both teams announced the games had been postponed.
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