CNN Radio News Day: April 17, 2013 by CNN published on 2013/04/17 20:51:07 +0000 Welcome to CNN Radio News Day. Police and the FBI have been feverishly sifting through thousands of photos and hundreds of hours of video from Monday's terrorist attack on the Boston Marathon, and today comes word that their hard work is paying off. Authorities tell CNN they want to question a man who was seen, on video, wearing a white baseball cap, a light-colored hooded sweatshirt, and a black jacket. Boston Mayor Thomas Menino was briefed on the evidence: "They have more videos on this one than any case the FBI ever had. Especially across from Lord & Taylor where the bombing, second bombing, happened. They have direct camera right on the location." Yesterday the FBI intercepted an envelope containing deadly ricin addressed to Mississippi Senator Roger Wicker. The letter read: "To see a wrong and not expose it is to become a silent partner to its continuance." It was a shocking story, but today it took an unexpected turn when the FBI and Secret Service announced a similar letter had been sent to President Obama. White House Spokesman Jay Carney spoke about the incident at today's press briefing: "There was a letter, sent to, addressed to the president that at an off-site mail facility, was noticed to contain a suspicious substance, and tests were undertaken." Information begins to stream out instantly these days after a big news event like the terrorist attack in Boston, and many Americans are now following stories on social media. But that can raise some big issues about what's true and what's not. CNN's tech writer Doug Gross explains: "I think it's an unfortunate sign of our times... and it is kind of mind-boggling why more people don't verify,verify, verify - like always check your source. If you say 'Twitter is where you get my news' it's the same as if it were a telephone and that's where you are getting your information. You have to consider who is sharing that information, if it's someone you've never heard of, if it's someone that's getting retweeted go to a ligament source. If it seems like a big story, it's going to be out there somewhere else."