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Suspect dead, another at large after police chase

Essdras M. Suarez/Globe Staff

An armored vehicle sped through Watertown after an MIT police officer was shot and killed, and an armed carjacking led police on a frenetic chase into Watertown.

Police officers searched for a suspect in Watertown. they are warning residents to not leave their homes.

Matt Rourke/ AP

Police searched Watertown for the "white hat" suspect in the Marathon bombing. They are warning residents not to leave their homes.

FBI

According to police, the "white hat" suspect from the Marathon bombings is still at large. Here is a closeup of him and a photo of him with the "black hat" suspect at the Marathon.

David L. Ryan/ Globe Staff

A convenience store at Memorial Drive and River Street in Cambridge became a crime scene after two men carjacked an SUV at gunpoint.

Aram Boghosian for The Boston Globe

The events began with a reported shooting at the intersection of Vassar Street and Main Street in Cambridge.

Police on scene after a reported shootout on Mt. Auburn Street in Cambridge.

Aram Boghosian for The Boston Globe

Police were on the scene after a reported shootout on Mt. Auburn Street in Cambridge.

Aram Boghosian for The Boston Globe

Police used a K9 unit to search nearby train tracks in Cambridge.

Mario Tama

A police chase after an apparent carjacking led to Watertown, where a firefight ensued.

Craig Ruttle/ AP

Heavily armed officers arrived in Watertown.

Essdras M. Suarez/Globe Staff

Police secured the area in Watertown.

Essdras M. Suarez/Globe Staff

Police told residents not to come out of their homes in Watertown.

FBI

The FBI Thursday released photos and video of two suspects in the deadly Boston Marathon bombings, appealing to the public to help find them.

Marathon Bombings

Manhunt underway in Watertown

Police are searching a 20-block area for the “white hat” suspect in the Marathon bombings after a wild night that included a shootout and police chase that left one officer dead.

Kevin Cullen

Coming face to face with them

Upon seeing photos of the Marathon bombing suspects, Bostonians thought of the victims, not vengeance. That’s how we honor Martin and Krystle and Lingzi.

Mourners turn street corner into makeshift memorial

The intersection of Boylston and Berkeley streets in Boston has become the unofficial people’s tribute to the three dead and more than 170 injured.

Jessica Kensky Downes and Patrick Downes each lost a leg in Monday's bomb attack during the Boston Marathon.

Newlyweds, both hurt in Marathon attack, touch hearts online

Rising from his wheelchair, Mayor Thomas Menino seemed to embody the fortitude of his city, knocked down but fighting to stand.

Menino takes a stand after Boston attack

Officer's rescue of boy makes cover of Time Magazine

Boston Police officers stood near the finish line of the Boston Marathon on Tuesday morning.

Special section

Coverage of the marathon bombings

More coverage of the bombings

About 2,000 people packed the Cathedral of the Holy Cross in Boston to unite with clergy and political leaders and remember the victim's of Monday's bombings. Many of the attendees said the service provided both solace and solidarity and left them inspired.

Obama pledges Boston 'will finish the race'

The president promised the perpetrators of the Marathon bombings would be brought to justice and that the community’s resilience would carry it forward.

Opinion on the bombings

Derrick Z. Jackson

President Obama listened to remarks from Mark Barden, left, whose child was murdered at Sandy Hook Elementary School, alongside other victims of gun violence, following a Senate vote on background checks for firearm sales Wednesday.

Tough on violence?

As Democrats and Republicans praised the courage of first responders and citizens who comforted victims in Boston, a bipartisan Senate gun-control compromise was killed in the Senate.