Race officials, runners, and onlookers observe a moment of silence for the victims of the Sandy Hook Elementary School shooting in Hopkinton, Mass.
Fifty-three wheelchair competitors start, according to BU News Service live blog/Twitter feed.
Fifty-one elite women runners are off.
Elite men and other top male runners (3,000 total) set off.
Remaining runners (about 24,000) begin race, according to NBC. As second wave leaves, first men’s wheelchair athlete, Hiroyuki Yamamato of Japan, crosses the finish line.
Maryland woman Tatyana McFadden win’s women’s wheelchair division. Her time was 1:45:23.
Rita Jeptoo of Kenya crosses the finish line as women’s elite winner. Her time was 2 hours, 26 minutes, 25 seconds.
Lelisa Desisa of Ethiopia crosses finish line as men’s winner. His time was 2 hours, 10 minutes, 22 seconds.
Two explosions erupt a block a part within eight seconds of each other on Boylston Street. Thousands more runners are still streaming toward the finish line.
Race volunteers, emergency workers on the scene rush to aid the wounded. Medical tend set up for fatigued runners serves as a makeshift trauma clinic. Gray smoke pervades the air in front of Forum restaurant, which was at the epicenter of one explosion.
Boston police report an incident at 673 Boylston St. in Boston, but do not say what it is. Boston police, fire and other emergency personnel respond. Marathon headquarters at Fairmont Copley Plaza Hotel locked down.
Near the finish line of the Boston Marathon, two or more unexploded bombs are found and disarmed
Boston officials report at least two dead and over 100 injured. They report that many victims had their legs severed. Senior U.S. officials report that another undetonated bomb was found near the finish line, according to NBC News. The FAA halts all flights in and out of Boston’s Logan International Airport.
President Obama urges people not to jump to conclusions and vows to bring those responsible for the blast to justice.
Thousands of mourners holding candles and flags gather together overnight and through the early morning hours of April 16 in vigils for the lives lost during the bombing
Boston Police Commissioner Ed Davis announces the death toll rises to three in Boston Marathon explosions.
President Obama announces that the F.B.I. is investigating the attack as “an act of terrorism,”
Dr. George Velmahos of Boston General Hospital tells reporters that the bombs used in the April 15 bombing were created out of pressure cookers and packed with shrapnel consisting of metal, nails and ball bearings.
Authorities have identified the image of a suspect through Lord & Taylor surveillance video
President Obama travels to Boston and gives a speech at a interfaith prayer service at the Cathedral of the Holy Cross
FBI Special Agent in charge of the Boston division Richard DesLauriers releases images and video captured from closed-circuit surveillance cameras that show Tamarlan and Dhzokhar Tsarnaev on the sidewalk in the proximity of the Boston Marathon finish line.
26-yearl-old Boston bombing suspect Tamerlan Tsarnaev calls his uncle, initiating a five-minute conversation and asking for forgiveness, the uncle asserts.
The president of BU posts an open letter on the school's website confirming that Lingzi Lu, a Chinese graduate student pursuing mathematics at Boston University is one of the victims.
At 10:30 PM, MIT issued an alert telling students to stay indoors, because of a shooting on campus. MIT police officer Sean Collier, 27, was allegedly killed by the marathon bombing suspects.
The alleged marathon bombers carjack a Mercedes in Cambridge. The car's owner eventually escapes the car, calling 911 and leading to a shootout in Watertown.
After the carjacking victim escapes, the bombing suspects confronted police in Watertown.
At the Watertown shootout, the alleged marathon bombers threw out makeshift bombs and shot at police. The older brother, Tamerlan Tsarnaev, was pronounced dead at Beth Israel Deaconess Medical Center at 1:35 AM, as a result of gunshot wounds and being run over by a car. Hi younger brother escapes on foot.
Streets are devoid of people, and most businesses are closed, while a city-wide manhunt for Boston marathon bombing suspect Dzhokar Tsarnaev locks down Boston. (Photo by Micaela Bedell)
Law enforcement members search for Dzhokhar Tsarnaev, a remaining suspect in Boston Marathon bombing, throughout Watertown after the two suspects led police on a chase early this morning. Police systematically search homes in the area with SWAT teams and K-9 units. (Photo by Micaela Bedell/BUNS)
The search continued most of the day, well into the afternoon. Law enforcement continued to for Dzhokhar Tsarnaev, a remaining suspect in Boston Marathon bombing, throughout Watertown. Police systematically searched homes in the area with SWAT teams and K-9 units. (Photo by Micaela Bedell/BUNS)
Police lift the lockdown order. Suspect Dzhokhar Tsarnaev, 19, had been hiding in a boat in Watertown, Mass. Authorities responded to a call from a Watertown resident, after he saw that a tarp covering his boat had been opened and there was blood on his boat.
People gather at the intersection of Boylston and Hereford streets at a memorial from Monday's attacks at the Boston Marathon upon hearing that Dzhokhar Tsarnaev, one of the suspects in the attacks, had been apprehended. (Photo by Kristen Keesee/BUNS)
Crowds gather in the Boston Common to celebrate the efforts of the Boston Police Dept., FBI, and National Guard in apprehending Dzhokhar Tsarnaev, the 19 year-old suspect in the Boston Marathon bombing. (Photo by Kristen Keesee/BUNS)
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