Boston Bombs: Victim's Mother 'Heartbroken'

The mother of one of the victims of the Boston Marathon bombings has paid an emotional tribute to her daughter.

Krystle Campbell, 29, was the second of the three people killed in the blasts on Monday to be identified.

She had gone with her best friend to take a picture of the friend's boyfriend crossing the finish line on Monday afternoon when the bombs went off.

Mother Patty Campbell said: "She was a wonderful person and everyone who knew her loved her.

"She was always smiling and was such a hard-worker in everything she did. This just doesn't make any sense."

It has since emerged that Krystle Campbell's parents were originally told their daughter had been badly injured but would survive.

The New York Daily News reported that doctors had confused Krystle with her friend Karen Rand, who was by chance carrying Krystle's ID. Karen Rand had surgery to a badly injured leg.

William Campbell Jr, 56, said: "We had the doctors come out and tell us everything they did (on the survivor) - and it wasn't our daughter."

Boston University said the third victim was a graduate student who was watching the race with friends at the finish line, close to the university.

The Chinese consulate said the victim was an exchange student, but has not identified them.

The first victim to be identified, eight-year-old Martin Richard, was waiting with his family to give his father a hug at the finish line when he was killed.

His sister Jane lost a leg and his mother Denise, 43, is understood to have undergone surgery for a serious head injury after they were also caught in the blast.

President Obama will visit Boston on Thursday and will attend an interfaith service in memory of those killed.

On Tuesday, he branded the bombings an act of terrorism, but said investigators did not know whether they were carried out by a solo bomber or a group.

The FBI also vowed to "go to the ends of the Earth" to find out who carried out the attacks.

More than 24 hours since the twin blasts, the FBI has few breakthroughs to report and no apparent motive.

Special agent Rick DesLauriers said that specialists in Virginia will "reconstruct the device".

Doctors have revealed the extent of the injuries suffered by those caught in the blasts, including details of a nine-year-old girl who had lost her leg and a 10-year-old boy who suffered deep shrapnel wounds.

Several people have had to have limbs amputated and others are at risk of losing legs following the blasts that ripped through crowds during the city's marathon.

The explosive devices involved pressure cooker bombs hidden inside duffel bags packed with nails, shards of metal and ball bearings, placed on the ground around 100m apart along the finishing stretch of the Boston Marathon route.

Seventeen people remain in a critical condition after the blasts.

Security has been stepped up in Washington and New York, and Boston remains on high alert, although there have been no immediate claims of responsibility for the attack.

Police are said to have questioned a 20-year-old Saudi Arabian man who is being treated for injuries at a hospital in Boston.

Officers have searched his apartment in Revere, according to his flatmate.