Robert McFadden spoke with host, Robert Siegel. The Massachusetts state police held a press conference on the latest developments in the Boston Marathon bombing investigation.

Robert McFadden, senior VP at The Soufan Group, talks with Tom Keene about the transfer of information from foreign countries on potential terror suspects in the United States. He speaks on Bloomberg Television's "Bloomberg Surveillance."

(CBS News) Amid the cheers of celebration and the sighs of relief all across Boston -- all across this country -- the investigation into the bombings and their perpetrators is moving ahead, as John Miller reports.

Monday's bombing at the finish line of the Boston Marathon on Patriots' Day propelled America back to a 9/11 mindset. Tuesday through Thursday were pre-occupied with grief, manhunts and memorial services. Poisonous envelopes mailed to the president and two US senators, along with a massive explosion at a fertilizer plant in Texas, only added to the low hum of anxiety.

BOSTON -- Moments after investigators went before television cameras to broadcast photos of the two men in ball caps wanted for the Boston Marathon bombing, queries from viewers started cascading in -- 300,000 hits a minute that overwhelmed the FBI's website.

Despite the appalling attack in Boston, the organizers of the London Marathon have announced that the race will go ahead on Sunday as planned. This is the right decision. The British public, and Londoners in particular, have an unfortunately long experience of terrorism. To an extent they've learned to live with the threat the hard way. In the 20 years between 1973 and 1993, there were around 35 terrorist attacks in London, conducted by the IRA. Almost all were in public places and designed to cause casualties among ordinary citizens...

Lauren Crabbe went to Boston on business. She was there to do some research and a little networking for the coffeeshop she?s opening. She never expected that the photos she snapped might be evidence in a bombing investigation.

"I used to think it was possible for an artist to alter the inner life of the culture," wrote Don DeLillo in his 1991 novel "Mao II." "Now bomb-makers & gunmen have taken that territory." As this morning's police standoff unfolded in Watertown, Massachusetts, that line popped into the head of the author Tom Vanderbilt, who tweeted (to much "favoriting" from his 6,000 followers): "Not sure whether to follow Twitter or just drag the DeLillo down from the shelf."

April 18 (Bloomberg) -- Don Borelli, chief operating officer at The Soufran Group, talks with Bloomberg's Tom Keene about how complicated it is to investigate a case as big Monday's Boston Marathon bombing. He speaks on Bloomberg Television's "Bloomberg Surveillance."

A possible suspect has been identified in the Boston Marathon bombing. CNN reports the suspect was detected on a department store surveillance video, believed to be on a camera positioned on the roof of a Lord & Taylor store directly overlooking the crime scene.