16:09

Police still guarding the front entrance of Brigham and Women's Hospital in Boston, reports Jim Lokay of WCVB. He continues: At last check, 31 of the injured are being treated at the hospital.

First look at Tuesday's front page of The Washington Post

15:53

France has ordered police patrols and security around public buildings to be stepped up, The Wall Street Journal reports. "New precautionary measures were taken without panic and dramatization," Interior Minister Manuel Valls said Tuesday on RTL radio.

French police were already at a heightened state of awareness following the country's military intervention in Mali to dislodge Islamist militants there, Mr Valls added.

The police earlier this year raised the national security alert to "strengthened red", the second-highest level.

15:26

Boston native actor Mark Wahlberg spoke of his own personal gain and pain from being in New York last night for the premiere of his new film 'Pain and Gain'.

"I really didn't even want to come tonight. I hadn't really heard much - I spoke to my mom, and most of my family seems to be OK. It's such a big event, there's so many people there.  It's horrible man. It's (expletive) disgusting, man. I just - I'm very upset."

"You try to put everything in God's hands and whatever happens here is out of our control and there's a bigger picture. But it's still obviously upsetting."

15:00

The brothers who both went to watch the Boston Marathon and ended up each losing a leg are just some of the horror stories emerging from the city. Kevin Cullen also writes about "In an instant, a perfect day had morphed into something viscerally evil’ in one of a number of excellent stories from the Boston Globe. [Read More]

14:11

The Boston Fire Dept tweeted: A sad day but a day where training, pre-planning, unified command and a quick first response by many saved lives. Meanwhile, the hunt for the bombers continues as the FBI examines the crime scene and unexploded device.

14:05

Teams of federal and local law enforcement agents searched an apparently vacant fifth floor apartment on Ocean Avenue in the Boston neighborhood of Revere, residents told ABC News.

Marcus Worthington, a law student who lives in the apartment complex, said he saw dozens of law enforcement vehicles arrive at his building Monday afternoon, including FBI, ATF and local police and fire departments.

13:40

The first names of the victims are beginning to emerge. The Boston Globe has named the 8-year-old killed as Martin Richard, the son of William and Denise Richard who are in hospital injured alongside their daughter. Another daughter waiting at the finish line in the race was unharmed. The family is reportedly from the Ashmont section of Dorchester where their father Bill is a community leader.

12:59

Sporting games across the US are being cancelled out of respect to the victims of the bombing, networks in the US report.