A 20-block area in Watertown, Massachusetts is in lockdown on Friday as police look for one of the suspects in the Boston Marathon bombing identified as Dzhokhar A. Tsarnaev, 19. He is still alive as of Friday noon and is either wearing an explosive vest, or has explosives with him, CBS News reports citing Federal sources.

Dzhokhar's brother, Tamerlan, 26, who is the second suspect in Monday's bombing, was killed in the early morning of Friday.

While the Boston Globe reports that heavily armed police are searching for Dzhokhar in Watertown, citing a State Police spokesman, there are other reports that claim that the suspect may have fled to New York City.

According to the New York Times, authorities in Boston notified the transit police department that there were chances that Dzhokhar boarded the last Amtrak train from Boston to New York City early Friday.

Authorities reportedly stopped that train between the East Norwalk and Westport, Ct., stations and inspected the train but did not find the suspect, according to the New York Times.

According to the report, police were searching if the suspect got off in previous stations.

It is unclear whether the suspect did escape to New York City and appears that all police efforts are focused in searching for him in Watertown, where neighbors have been told to lock themselves in their houses, don't open the door to anyone and get away from windows.

Also on Friday, a report surfaced that the suspects' sister lives in West New York, New Jersey, just across the Hudson River from Midtown Manhattan.

The woman reportedly identified the Boston Marathon bombers as her brothers, according to the New Jersey Ledger.

"They were great people. I never would have expected it," the woman said on news that the suspects orchestrated the bombing. "They are smart - I don't know what's gotten into them."

"No one is okay right now," she told the New Jersey Ledger. "I'm hurt for everyone who has been hurt. I'm sorry for all the people who are hurt and for all the people who lost their lives."

Three people died in the bombing and nearly 180 were injured.

The pursuit for the suspects began after 10 p.m. Thursday when two men robbed a 7-Eleven store near Central Square in Cambridge, reports the New York Times.

A security camera reportedly caught a man identified as one of the suspects wearing a gray hooded shirt.

About 10:30 Boston police was notified that an M.I.T. Patrol Officer, now identified as Sean Collier, 26, had been shot near the Stata Center on the MIT campus. The officer was found with multiple gunshots and was pronounced dead at the hospital.

A short time after the officer's death, two men carjacked a black Mercedes SUV at gunpoint, according to the Boston Globe. The owner of that car was able to flee at a gas station on Memorial Drive, reports the paper.

When they drove away towards Watertown, "a long train of police vehicles," were following them, reports the Boston Globe. The two men started to shoot at police and one police officer was wounded.

Neighbors in Watertown told Boston Public Radio WGBH 89.7 that they heard gunshots and explosions in the neighborhood on Friday morning.