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Tragedy Unfolds - A day of celebration quickly turned to peril after two explosives were detonated near the finish line of Monday's Boston Marathon. At least three people were killed and 130 were reported injured, according to police, who are still on the scene investigating what prompted this tragic event. Warning: some of the images are of a graphic nature. — Britt Middleton Monday morning, about 27,000 runners set out to finish the 26.2 mile course. Now in its 117th year, the Boston Marathon is the world's oldest. (Photo:   David L. Ryan/The Boston Globe via Getty Images)

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Dessia for the Win - Ethiopia's Lelisa Desisa took the title in the men's competition, finishing in 2 hours, 10 minutes, 22 seconds. (Photo:  Jim Rogash/Getty Images)

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Jeptoo's Golden Streak - For the women, Kenya's Rita Jeptoo took this year's honors, her second time winning the race since 2006. She finished in 2 hours 26 minutes and 25 seconds. (Photo:  Jim Rogash/Getty Images)

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A Tragic Scene - Sadly, the day quickly took a frightening turn. At about 2:45pm, about an hour after the first runners crossed the finish line, two explosions went off, cloaking Boston's Copley Square in smoke. (Photo: AP Photo/WBZTV) 

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Smoke Everywhere - Emergency responders tended to the injured in the streets. (Photo: Kelvin Ma/Bloomberg via Getty Images)

Photo By Photo: Kelvin Ma/Bloomberg via Getty Images

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Only Two Explosives Were Discovered - "Two and only two explosive devices were found yesterday," Massachusetts Gov. Deval Patrick said Wednesday, discounting earlier reports that two more unexploded devices were found in the area.   (Photor: Kelvin Ma/Bloomberg)

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Taking Precaution - Washington D.C., New York, Los Angeles and San Francisco ramped up their security following Monday afternoon's incidents while London officials are reviewing security plans for Sunday's London Marathon. Police Commissioner Edward Davis urged people to stay indoors and not congregate in large groups. (Photo:  John Tlumacki/The Boston Globe via Getty Images)

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Rendering Aid - If you are searching for family and friends, visit redcross.org/safeandwell for more information on how to locate them. (Photo: David L. Ryan/The Boston Globe via Getty Images)

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More Assistance Available  - Google has launched a person-finder site, where people looking for a loved one or those who have information about another person can make reports. Family members seeking to get information about loved ones can call the Boston Mayor’s Hotline at (617) 635-4500 or (617) 414-6030. (Photo: AP Photo/Charles Krupa)

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Pandemonium - "You could smell it. It smelled like a giant firecracker...Then there was immediate pandemonium," an eyewitness told NBC News. Others reported a horrific scene of blood in the streets. (Photo:  Alex Trautwig/Getty Images)

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Another Incident - Initially thought to be related to the marathon bombings, a third explosion at the John F. Kennedy Presidential Library & Museum was later ruled out as an unrelated fire-issue, according to the Boston Police Twitter page. (Photo: Kelvin Ma/Bloomberg via Getty Images)

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Managing the Aftermath  - (Photo: AP Photo/Charles Krupa)

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Praying for Peace - A woman kneeled and prayed on Boylston Street. (Photo: John Tlumacki/The Boston Globe via Getty Images)

Photo By Photo: John Tlumacki/The Boston Globe via Getty Images

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First Responders on the Scene - (Photo: AP Photo/Elise Amendola)

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Obama: "We Will Get to the Bottom of This" - President Obama spoke from the White House on Monday evening regarding the bombings. He said his administration has made "every single federal resource necessary" to help the city recover.  "We still do not know who did this and why. But make no mistake, we will get to the bottom of this." (Official White House Photo by Pete Souza)

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Uncovering the Truth - Speaking from the White House on Tuesday, President Obama said that the FBI is investigating the bombings as "an act of terrorism." Authorities have not identified a suspect in the ongoing investigation. (Photo: REUTERS/Dominick Reuter)

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Remembering Martin Richard - Martin Richard, 8, was identified as one of three people who were killed on Monday. Martin came to the race to cheer on his father, who was running in the race. The boy's mother faced severe injuries to her brain and underwent surgery and his sister lost a leg. (Photo: Family Photo via Facebook)

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Bombs Believed to be Made with Pressure Cookers  - Pressure cookers are believed to have been used to make the crude bombs. "The FBI has not commented on the nature of the two devices used in the blasts, but sources close to the investigation say shredded pieces of pressure cookers were found at the blast sites, indicating the bombs were made from kitchen devices," FOX news reported. (Photo:  AP Photo/The Boston Globe, John Tlumacki)

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Crude Bombs Filled with Nails, Pellets - Among reported injuries were those resulting from nails, pellets and other small, metallic objects placed inside the bombs. "We've removed BBs and we've removed nails from kids. One of the sickest things for me was just to see nails sticking out of a little girl's body," Dr. David Mooney, director of the trauma center at Boston Children's Hospital, told the Associated Press. (Photo: AP Photo/MetroWest Daily News, Ken McGagh)

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Keeping Watch - Emergency personnel surveyed the scene. (Photo:  David L. Ryan/The Boston Globe via Getty Images)

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On High Alert - According to reports, federal law enforcement agencies have been placed on "level one mobilization" as the investigation into the bombings continue. (Photo: Alex Trautwig/Getty Images)

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Helping the Fallen - Eight of the victims were children, CNN reported, with one of the dead being an 8-year-old child. (Photo: John Tlumacki/The Boston Globe via Getty Images)

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A Day Marked by Tragedy - Emergency personnel transported a man from the scene on Boylston Street. (Photo: Bill Greene/The Boston Globe via Getty Images)

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Severe Injuries - Medical experts reported that many victims sustained severe injuries on the lower portion of their bodies, with the worse injuries resulting in amputations at local hospitals. In this photograph, Jeff Bauman Jr., 27, was tended to by emergency staff after the blasts. Badly injured, he later had both legs amputated, his father told the AP. (Photo: AP Photo/Charles Krupa)

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A Change in Course - After the blasts, hundreds of runners who had not finished the race were stopped before the Massachusetts Avenue overpass as first responders rushed to care for the injured. (Photo: Yoon S. Byun/The Boston Globe via Getty Images)

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Runners Mourn in the Streets - (Photo: AP Photo/Winslow Townson)

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Rushing to Safety - Medical workers rushed an injured man away from the scene. (Photo:  AP Photo/The Boston Globe, David L. Ryan)

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A Haunting Quiet - A volunteer sorted through unclaimed runners' bags in the hours after the melee. (Photo: Kelvin Ma/Bloomberg)

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#PRAYforBOSTON - You can follow more of BET's coverage of the Boston Marathon on Twitter by using the hashtag #PRAYforBOSTON. (Photo: David L. Ryan/The Boston Globe via Getty Images)