Timeline: How the chase of bombing suspects developed

(CNN) -- Developments in the Boston Marathon bombings investigation have come quickly since the release of the photos of the suspects:Thursday5 p.m. -- The FBI releases pictures of two male suspects they are seeking in connection with the Boston Marathon bombings.Late Thursday -- A robbery is reported at a 7/11 convenience store, not long after the FBI released images of the suspects.11 p.m. -- Police respond to a call on the campus of the Massachusetts Institute of Technology, where university police officer Sean Collier was shot.

Troubled North Caucasus region still scene of conflict

(CNN) -- Conflict has racked the North Caucasus region for almost two decades.The troubled region includes the breakaway Russian republic of Chechnya, as well as Dagestan, Ingushetia, Kabardino-Balkaria and North Ossetia.Chechen rebels started out fighting for independence from Moscow in the 1990s, but in recent years, the violence has been aimed more at imposing Islamist rule and asserting their authority in the area.The Chechen population of about 1 million is mostly made up of Sunni Muslims, who maintain a distinctly different cultural and linguistic identity from Russian Orthodox Christians.The standard of living in the southwestern republic in the Caucasus Mountains is poor, compared with the rest of Russia.

College police officer shot dead on MIT campus

(CNN) -- Violent incidents early Friday, including the shooting death of a college police officer, kept Bostonians on edge just days after the bombing of the iconic Boston Marathon.Howling sirens pierced the night quiet, and flashing lights lit up the darkness, as dozens of officers from state and city police responded to the deadly shooting on the campus of the Massachusetts Institute of Technology in Cambridge.

Violence haunts Boston area in wake of Marathon terror

(CNN) -- Violent incidents early Friday, including the shooting death of a college police officer, kept Bostonians on edge just days after the bombing of the iconic Boston Marathon.Howling sirens pierced the night quiet, and flashing lights lit up the darkness, as dozens of officers from state and city police responded to the deadly shooting on the campus of the Massachusetts Institute of Technology in Cambridge.

FBI identifies two suspects in Boston Marathon bombings

(CNN) -- The FBI on Thursday released photos and video of two men it called suspects in the deadly bombings at the Boston Marathon and pleaded for public help in identifying them.The two men were photographed walking single file down Boylston Street near the finish line of Monday's marathon before the explosions that killed three people and wounded about 180.

Boston bombings, other incidents have us 'looking for a way out'

(CNN) -- The thought came to Don Walker during that most quintessential of American outings -- a baseball game.Caught in a crush of people on his way into Atlanta's Turner Field, he couldn't help but think about what had just happened in Boston -- sports fans crowded into a small space, a bomb tucked into a backpack, and then death.Not that it stopped the Morgantown, West Virginia, man from enjoying his Atlanta vacation."You just watch things more closely," he said.Americans are doing a lot of that these days, especially after Monday's attack on the Boston Marathon, where three people died and more than 180 were wounded when a pair of bombs exploded near the finish line:• A palpable sense of fear and confusion played out in the nation's capital, at a Senate office in Michigan and on television screens across the country as authorities scrambled to deal with a spate of suspicious package reports.

Obama's message in Boston: Defiance mixed with reassurance

(CNN) -- President Obama brought a mixture of reassurance and defiance to Boston on Thursday to help heal a city hit hard by terrorist bombs."Every one of us stands with you," the president said at an interfaith service inside the Cathedral of the Holy Cross. "Boston may be your hometown -- but we claim it, too. ...

VIDEO: Boston Bruins fans unite, sing national anthem

BOSTON (WITI) -- Hockey fans in Boston united on Thursday evening, April 17th -- to show their pride in their city and nation in the wake of the bombings at the Boston Marathon earlier in the week.It was the first hockey game for the Boston Bruins since the tragedy.

Source: Two men sought as possible suspects in Boston bombing

(CNN) -- Two men seen in images near the finish line of Monday's Boston Marathon -- moments before two bombs there exploded -- are of "high interest" and are considered "possible suspects," a law enforcement official said.A circular sent out Wednesday by authorities indicated the attached photos, showing the two men, were being sent around "in an attempt to identify the individuals."The official said the men were of interest because of where they were at a particular time and what they were carrying.

EXCLUSIVE: One-on-one interview with Boston Police Comm.

BOSTON (WITI) -- Following the tragedy in Boston after explosions near the finish line of the Boston Marathon, every police officer in Boston is turning 12-hour shifts right now, as controlling the crime scene is a massive job -- the most complex the city has ever seen.

Officials continue hunt for Boston Marathon bomber

(CNN) -- Three people were killed and more than 180 others were injured by two bombs that exploded near the finish line of the Boston Marathon on Monday afternoon, officials said.

Memorial established at site of Boston bombings

BOSTON (WITI) -- Much of the city of Boston has begun to move on after the tragedy at the Boston Marathon on Monday, but Boylston Street remains closed down -- a fresh reminder of the lives lost and people injured after two bombs went off near the finish line of the marathon.

Residents in Boston have difficulty getting around after tragedy

BOSTON (WITI) -- Boylston Street remained a very active crime scene on Wednesday, April 17th following the bombings at the Boston Marathon on Monday that left three dead and nearly 150 injured.Seven blocks of Boylston Street were blocked off and under police protection -- as military police stood guard in camo with armored vehicles.