On April 15, 2013, everything changed. On a day that’s normally joyous as triumphant runners cross the finish line of the Boston Marathon, two blasts took lives, injured many others, and shook the city and the nation. Here’s a look back at the extraordinary events of the week through the lenses of Boston University Photojournalism program photographers. (Click full screen to view.)

Day One: Shock, Confusion

Breaking: Explosions Reported Near Marathon Finish Line
Several explosions and injuries have been reported near the site of the Boston Marathon finish line. BU News Service reporters are headed to the scene. Updates to come.
BU News Service Reporter Hears Blast
Boston University News Service reporter Lisa Kashinsky, who was live-tweeting the race, was near the finish line and heard the explosions.
VIDEO: Finish Line Chaos
BU News Service's Kiva Liu was at the finish line at the time of the first explosion. Her camera was rolling as the confused crowd ran from the scene and bystanders rushed to help victims.
Updates: BU Student Among the Injured
Latest on the marathon explosion. Check here for up-to-date coverage.
Photo Gallery
BU News Service photographers were on the scene following of the explosions at the 117th Boston Marathon. Here's a selection of the images that they captured.
VIDEO: Stopped Runners React to Explosions
BU News Service's Victoria Price was on the scene moments after the bombs, speaking with runners as they were diverted from the crime scene.

The Aftermath

Interactive: Timeline of Attacks and Attempts
A look at bombings and failed attempts in the US over two decades.
"We have to go, we have to go..."
I heard clapping, whistling, and cheers, then an unfamiliar sound, Heather Hamacek writes.
Runners Share Stories Day After Marathon
The morning after the tragedy and chaos near the finish line of the 117th running of the Boston Marathon, some runners shared their stories.
Student Witnesses Explosion Injuries
Panicha Imsomboon, a BU journalism graduate student, stood on the final stretch of the Boston Marathon track when she heard a bomb to her left.
Video: BU Students React
Boston University students share stories of their experiences on the day that tragedy struck the city.
The Story Through Photos on Social Media
The world took to social media as events unfolded in Boston. Here's a selection of images that told the story. (Compiled by Nicholas Koop)
UPDATE: Third Victim Grad Student at BU
Authorities are now confirming that a Boston University graduate student was among those killed.
Tears, Remembrance at Vigils Across the City
Marathoners, residents, students and city leaders gathered on darkened and windy streets, plazas and churches in Boston Tuesday night to remember the victims.
Nation Stands in Solidarity with Boston
This week, as front pages are covered in horrific images of the tragedy at the Boston Marathon on Monday, the city has been receiving support and solidarity from all over the country and the world.

Remembrance and Sorrow

Longtime Runner Recalls Harrowing Race Day
Update: Runner profiled in BU News Service story recounts what happened as he neared the finish of the race.
Warren Remembers Victims on Senate Floor
Washington - Sen. Elizabeth Warren, D-Mass., remembered the victims of the attack in her first speech on the Senate floor since being sworn in this past January.
Bells Ring in Tribute
AUDIO: Two self-taught bell ringers join churches around the world in tribute to the dozens injured and 4 killed in last week's attack, Taylor Walker reports, photos by Jun Tsuboike.
Obama to Boston: 'You Will Run Again'
City seeks solace at interfaith service featuring remarks by president, religious and political leaders.
VIDEO: Obama Visits Bombing Victims
President Obama visited marathon bombing victims at Massachusetts General Hospital on Thursday. Mike Neff reports.
BU Establishes Scholarship in Honor of Slain Student
The trustees of Boston University have established a scholarship fund to honor the life of BU’s Lu Lingzi (GRS ’14). Board members started the fund by donating more than half a million dollars.
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The Manhunt, Lockdown and Capture

Video: Fallout from Conflicting Arrest Reports
Following a media frenzy that took place after conflicting reports of an arrest in the Boston Marathon Bombing case, area residents urge media caution. BU News Service reporter Patrick Thomas has the story.
FBI Releases Images of Two Suspects
The FBI released photos and video of two suspects in the Boston Marathon bombing on Thursday afternoon and asked for the public’s help in identifying them.
MIT Officer Killed, MBTA Officer Shot
At about 10:45 pm Thursday night an MIT Police Officer, Sean Collier, 26, of Somerville, was shot and killed responding to a call at Vassar and Main, said police.
Area in Lockdown
Boston area in lockdown as police hunt for second suspect in Watertown. Photos of empty roads and highways shared via social media tell the story.
2nd Marathon Bombing Suspect In Custody
Gun shots rang out in Watertown and law enforcement officials converged on a boat in a backyard on Franklin Street in Watertown, and peacefully took marathon bombing suspect Dzhokhar A. Tsarnaev into custody.
Celebration, Kudos as Gripping Drama Ends
A sampling of reaction online as word spread that the long drama had come to an end.