Boston Marathon Bombings - Monday, April 15,2013

 Rita Jeptoo(Kenya) left, and Lelisa Desisa(Ethiopia) right, crossing the finish line to win the women's and men's division of the 2013 running of the Boston Marathon in Boston

The blast occurred just before 3:00 p.m

A 29-year-old woman, remembered by her mother for her "heart of gold."

Lu Lingzi,a Boston University graduate student from China who was reportedly watching the race with her friend, Zhou Danling(right)

An 8-year-old boy, cheering on runners with his family.The 8-year-old boy who died in the Boston Marathon terror attack has been named as Martin Richard. He was one of 3 people killed by the explosion as he waited for his father to finish the race

Their lives were snuffed out by twin blasts at the tail end of Monday's Boston Marathon. Thirteen others -- out of 183 hospitalized -- had limbs amputated, according to hospital officials

The two identical pressure-cooker bombs -- each with the capacity to hold six liters of liquid, according to a Boston law enforcement source -- blew up seconds and a short distance apart on Boston's Boylston Street. Two bombs went off just before 3 p.m., shattering a festive atmosphere several hours after the legendary race began on the city's 238th annual Patriots' Day

Almost three-quarters of the 23,000 runners who participated in the race had already crossed the finish line when a bomb that had apparently been placed in a garbage can exploded around 2:50 p.m. in a haze of smoke amid a crowd of spectators on Boylston Street, just off Copley Square in the heart of the city. Thirteen seconds later, another bomb exploded several hundred feet away

Pandemonium erupted as panicked runners and spectators scattered, and rescue workers rushed in to care for the dozens of maimed and injured, some of whom lost legs in the blast, witnesses said

Site near the finish line of the Boston Marathon where there were explosions occurred investigated by two people wearing protective suits

More than a day later, authorities don't have an answer. Unlike after the September 11, 2001, attacks, no one claimed responsibility.

The FBI and state and local police are intensifying their probe into Monday's bombing at the finish line of the Boston Marathon, vowing a "worldwide investigation" and appealing to the public for tips and cellphone pictures that might yield clues about who was behind the horrific attack.

Items left at a makeshift memorial near the finish line of Monday's Boston Marathon explosions, which killed at least three and injured more than 140, in Boston.

US President Barack Obama visited the hospital to meet with patients who were wounded in the bombings in Boston and talks with staff at Massachusetts General Hospital in Boston.

FBI releases photos of two suspects - Thursday April 18,2013

 Both men carried backpacks that were believed to contain the bombs. The man identified as suspect No 1 wore a dark baseball cap. Suspect No 2 wore a white cap backwards and was seen setting down his backpack on the ground

The FBI releases photographs and video of two men suspected of planting the pressure cooker bombs that killed three people and injured 176 at the Boston Marathon on Monday. Video footage shows a man known as Suspect No1 wearing a dark baseball cap. He was later identified as Tamerlan Tsarnaev(26)

Suspect No.2 later identified as Tsarnaev's brother, DzhokharTsarnaev(19) was wearing a white cap backwards in the images. The 30-second videos are played repeatedly on national television, and photographs of the suspects are posted online 

On Thursday Night 10.30 P.M April 18,2013  -Police discover MIT campus police officer Sean Collier, 26, shot multiple times in his car in an apparent confrontation with the suspects. He was transported to Massachusetts General Hospital and pronounced dead 

Police say the two brothers hijack a car and abduct its owner for about a half hour before releasing him at a gas station where a security camera captures an image of someone who appears to be Dzhokhar Tsarnaev.

Police chase the car into the Boston suburb of Watertown. During the chase, the suspects throw explosives from the car and exchange gunfire with police.
A transit police officer is hurt in the shootout. Witnesses report hearing dozens of gunshots. Tamerlan Tsarnaev is hit during the shootout. He is taken into custody, transported to Beth Israel Deaconess Medical Center and later pronounced dead

On Friday 1 A.M April 19,2013 - A huge manhunt is launched for the second suspect and hundreds of police officers and FBI agents descend on Watertown.Massachusetts police announce they will conduct a door-to-door search in Watertown. Citizens are warned to stay indoors
Train service in Boston is suspended around 5.30 A.M
By 6 A.M - a heavy contingent of police reinforcements arrives in Watertown. At sunrise, they begin multiple sweeps through the streets. State police wear fatigues and carry sidearms and semi-automatic rifles. Some teams are accompanied by black armored trucks as they fan across neighborhoods
At 8 A.M - Massachusetts officials announce they have expanded the shelter-in-place recommendations for the entire city of Boston, effectively putting the city in lockdown as they search for Tsarnaev.
At 10.30 A.M - Police say they have located a gray Honda with Massachusetts license plates in the Boston area that they believe had been occupied by a Boston Marathon bombing suspect.
The search goes on, including with the help of Black Hawk helicopters. The manhunt covers 60 percent to 70 percent of the search area by afternoon
At 6 P.M - Police lift the stay-indoors request for the Boston area. Mass transit reopens. Suspect remains at large
Around 7 P.M - Gunfire erupts in Watertown and police converge on a house where the suspect is believed to be hiding.
Around 8.45 P.M - Boston police say they captured the suspect alive and taken into custody.Dzhokhar Tsarnaev was captured hiding in a boat parked in a backyard

Following a tense 24 hours for the Boston area, the manhunt ended with the 19-year-old suspect, Dzhokhar Tsarnaev, cornered, captured and taken into custody.