Manhunt Continues in Boston Metro Area for Boston Marathon Bombing Suspect

Numerous police agencies are continuing their manhunt for the second suspect in the Boston Marathon Bombing.

The Associated Press reports that Massachusetts State Police are going door-to-door in Watertown, MA, but the Boston Marathon suspect is still on the loose.

Col. Timothy Alben of the Massachusetts State Police said Friday afternoon that officers would go street to street as the manhunt for the bombing suspect continues. Gov. Deval Patrick urged residents to continue staying indoors.

A pair of brothers is suspected of killing a Massachusetts Institute of Technology police officer late Thursday, then stealing a car at gunpoint.

The suspects' clashes with police began hours after the FBI released photos and videos of them. Monday's bombings killed three people and wounded more than 180 others.

Twenty-six-year-old Tamerlan Tsarnaev (tsahr-NY'-ev) was killed overnight. His 19-year-old brother, Dzhokhar (JOH'-kahr) is on the loose.

At an early afternoon press conference, police announced they had discovered an explosive device in a house in Cambridge that will be purposefully detonated later today. Massachusetts State Police Superintendent Col. Timothy Alben said authorities are going home-to-home in search of the suspect and are chasing "several new leads."

FBI

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WASHINGTON (AP) — Government officials say Boston Marathon bombing suspect Tamerlan Tsarnaev traveled to Russia last year and returned to the U.S. six months later.

The 26-year-old Tsarnaev died in a police shootout overnight.

The officials spoke on condition of anonymity because they couldn't publicly talk about an investigation in progress. One says that Tsarnaev traveled out of John F. Kennedy International Airport in New York.

Investigators believe that Tsarneaev and his brother Dzhokhar are responsible for the deadly Boston Marathon terrorist attack. Dzhokhar is still being sought. The ethnic Chechen brothers are from Dagestan, which neighbors Chechnya in southern Russia. They lived near Boston and had been in the U.S. for about a decade, an uncle said.

One official said there are no known ties at this point to Chechen extremist groups.

Information from the Associated Press and ABC News used in this report