One of the two suspects in the Boston Marathon bombings is dead and the second is in custody after a massive manhunt in the Cambridge and Watertown, Mass. areas, according to published news reports.

Bombing suspect Dzhokhar Tsarnaev, 19, was on the loose Friday, April 19, after his accomplice brother was killed in a chain of events that left one cop dead and another injured, officials have said. At approximately 8:40 p.m., he was captured alive in a Watertown backyard. Police said he is injured and headed to a hospital for medical care.

The city of Boston and its suburbs, universities and transit system were on lock down most of the day, with residents being told to stay inside and only answer doors for law enforcement officials.

The older brother, Tamerlan Tsarnaev, 26, was killed after a wild chase and firefight, and an associate was taken into custody earlier in the day.

The "T" is back in service and mass transit is expected to be back to normal for the weekend.

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At a 5:15 p.m. press conference Thursday, April 18 at the Sheraton Hotel, the Federal Bureau of Investigation released still images from video and video of two young men the agency has identified as suspects in the Boston Marathon bombing attack, which took place on Monday afternoon, April 15.

Special Agent in Charge of the FBI’s Boston Field Office Richard DesLauriers urged the public to study the photos and videos and to contact investigators with any information they may evoke.

"We consider them to be armed and extremely dangerous," DesLauriers said at that time.

The images and videos may be viewed at fbi.gov. There also is a new website set up — bostonmarathontips.fbi.gov — for contacting investigators with information or people may call (800) 225-5324 (CALL FBI).

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Because Boston area mass transit has been halted, transportation from Maine to points south is limited. Boston’s South Station is closed, so trains are only running as far south as Exeter, N.H., and bus service to the station is suspended. Logan Airport is open, with heightened security, and southbound Concord Coach Line buses are still going to the airport. Greyhound has suspended all Boston-bound service.

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Friday morning, the University of Massachusetts at Dartmouth campus was evacuated. Dzhokhar Tsarnaev is enrolled as a student at UMass/Dartmouth. Early Friday afternoon, the shelter-in-place order was relaxed a bit. The state’s Undersecretary for Homeland Security urged people who had been taking shelter in businesses, shopping malls and stations to make their way home. Taxi service has been restored.

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Watch video and see photos of the suspects below.

Courier Publications news staff can be reached by phone at 207-594-4401 or by email at news@courierpublicationsllc.com.