WATERTOWN, Mass. (AP) - Police say one of two suspects in the shooting of an MIT police officer is dead and a massive manhunt is underway for another, who is tied to the Boston Marathon bombing.
Shortly after the MIT officer was shot Thursday night, police got a report of a carjacking in Cambridge, just outside Boston.
Police say of the at-large suspect, "We believe this to be a terrorist."
The FBI is investigating whether the fatal shooting of a campus police officer at the Massachusetts Institute of Technology and gunfire and explosions in a nearby town are related to the Boston Marathon bombings.
A Massachusetts State Police spokesman said early Friday that one person suspected in the gunfire and explosions has been accounted for and one is at large.
The FBI said it is working with local authorities to determine what happened.
The MIT shooting on the Cambridge campus Thursday night was followed by reports of violence in nearby Watertown, about 10 miles west of Boston.
State police spokesman David Procopio said there is a "strong possibility" the incidents are related.
The MIT officer had been responding to report of a disturbance Thursday night when he was shot multiple times, according to a statement from the Middlesex district attorney's office and Cambridge police. It said there were no other victims.
In Watertown, witnesses reported hearing multiple gunshots and explosions at about 1 a.m. Friday. Dozens of police officers and FBI agents were in the neighborhood and a helicopter circled overhead.
State police spokesman David Procopio said, "The incident in Watertown did involve what we believe to be explosive devices possibly, potentially, being used against the police officers."
Boston cab driver Imran Sais said he was standing on a street corner at a police barricade across from a diner when he heard an explosion.
"I heard a loud boom and then a rapid succession of pop, pop, pop," he said. "It sounded like automatic weapons. And then I heard the second explosion."
He said he could smell something burning and advanced to check it out but area residents at their windows yelled at him, "Hey, it's gunfire! Don't go that way!"
MIT said right after the 10:30 p.m. shooting that police were sweeping the campus in Cambridge and urged people to remain indoors. They urged people urged to stay away from the Stata Building, a mixed-use building with faculty offices, classrooms and a common area.
Hours later, MIT, which has about 11,000 students, said the campus was clear but the shooter was still on the loose.
The FBI has released images of two suspects connected to the Boston Marathon Bombing.
Officials say the suspects are armed and dangerous and no one should approach them or try to apprehend them.
The FBI says no piece of information is too small.
More FBI pictures, including higher quality photos can be found here.
BOSTON -- ABC News -- Authorities are close to identifying a suspect in the deadly Boston Marathon bombing, an official in Boston told ABC News.
ABC News' Boston affiliate, WCVB, reported a source had said a suspect has already been identified and an arrest is imminent. Surveillance video taken from cameras at a Lord & Taylor along the marathon route helped identify the suspect, WCVB said.
A pair of blasts erupted Monday afternoon near the finish line of the Boston Marathon, killing three people and injuring more than 170 others.
Authorities said they have been analyzing thousands of photos of the event and tracking down as many leads since the bombing. Tuesday ABC News reported part of a pressure cooker bomb had been recovered from the scene with wires, shrapnel and a circuit board. That evidence has been sent to the FBI lap in Quantico, Virginia for analysis, officials said.
BEIJING (AP) — A state-run Chinese newspaper says the third person killed in the Boston Marathon bombings is a Chinese graduate student at Boston University originally from China's northeastern city of Shenyang.
The Shenyang Evening News reported Wednesday on its official Twitter-like microblog account that the victim is named Lu Lingzi. An editor at the newspaper says that Lu's father confirmed his daughter's death when reporters visited the family home.
The Chinese Foreign Ministry and Consulate General in New York are not releasing the victim's name at the request of the family. But on Tuesday, Boston media quoted a Chinese Consulate General official as saying Chinese national Lu Lingzi was missing in the wake of the bombings that killed three and wounded more than 170 people.
Authorities are taking extra security precautions around St. Louis in light of the Boston bombings.
St. Louis Police and Metro Transit authorities say they'd added security measures downtown Tuesday during both the Mayor's inauguration and the Blues game. But they say there have been no specific threats made. The extra measures are precautionary.
There was a stepped up police and security presence both inside and outside Scottrade Center Tuesday night. Hockey fans endured long lines to get inside, passing through extra screenings that included metal detectors and bag searches.
Just before the Blues game against the Vancouver Canucks, the team paid tribute to the Boston victims with a moment of silence.
NEW YORK (AP) — The New York Yankees paid tribute to victims of the Boston Marathon bombings by playing the Fenway Park favorite "Sweet Caroline" at Yankee Stadium on Tuesday night.
Other teams around the majors did the same. The popular sing-along song has been featured at Boston Red Sox home games since 2002.
The Yankees honored Boston, home of their longtime rivals, by playing the Neil Diamond hit over the public-address system after the third inning against Arizona. Yankees fans sang along, and some people in the crowd wore Red Sox hats and jerseys.
"Thank you NY Yankees for playing 'Sweet Caroline' for the people of Boston," Diamond wrote on his Twitter page. "You scored a home run in my heart. With respect, Neil (hashtag)OneBoston."
A ribbon was shown on the scoreboard displaying the insignia of the Red Sox and Yankees and the words: "New York stands with Boston ... Pray for Boston."
There also was a pregame moment of silence. A message that read "United We Stand" showing the Red Sox and Yankees logos was posted on an electronic board atop the ballpark.
Earlier in the day, Yankees manager Joe Girardi said it was time to "put the baseball teams aside" and recognize "we're all behind the people in Boston."
"Sweet Caroline" also was played at Marlins Park, Dodger Stadium and in Cleveland, where the Red Sox beat the Indians 7-2.
"That was a very classy touch," said Indians skipper Terry Francona, who managed the Red Sox for eight years.
BOSTON (AP) - The young victim of the Boston Marathon bombings is being remembered as a vivacious boy who loved to run and climb.
Eight-year-old Martin Richard was among the three people killed in the explosions. That's according to a person who spoke with a friend of the family.
A candle burned on the stoop of the family's single-family home in the city's Dorchester section today, and the word "Peace" was written in chalk on the front walkway.
PESHAWAR, Pakistan (AP) — The Pakistani Taliban have denied any role in the bombings at the Boston Marathon that killed at least three people and injured more than 140.
The group's spokesman, Ahsanullah Ahsan, denied involvement in a telephone call with The Associated Press on Tuesday. He spoke from an undisclosed location.
The main focus of the Pakistani Taliban has been a bloody insurgency against the Pakistani government because of its alliance with the United States and to enforce Islamic law in the country.
But the group has threatened attacks in the U.S. as well, and claimed responsibility for a failed car bombing in New York's Times Square in 2010.
The Times Square attacker, Faisal Shahzad, has admitted to getting training from the Pakistani Taliban in the country's tribal region.
MOSCOW (AP) — The organizers of the World Athletics Championship in Moscow say they will beef up security in the wake of deadly explosions at the finish line of the Boston Marathon.
The August 10 to 18 event is seen as a dress rehearsal for the 2014 Winter Games in Russia's Black Sea resort of Sochi.
The R-Sport news agency on Tuesday quoted Valentin Balakhnichev, president of the Russian Athletics Federation, as saying that the organizers "will draw conclusions" from the Boston bombings.
Balakhnichev said the security standards they adhere to are high but the organizers "will take tougher measures" to ensure security.