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This year bringing their campaign of terror to the shores of alex ortiz, cbs news, cairo. >> glor: we've long been told aspirin can help reduce heart disease. now a new study says long-term regular aspirin use can substantially cut the risk of some kinds of cancer. here now to explain is dr. heather yeo of new york presbyterian-weill cornelle medical center. doctor, good to see you. why was this study so significant? >> thanks, jeff. actually, the study is important because it's one of the first studies to study patients, 130,000 patients actually, for such a long period of time. they studied ...

>> all lives matter. all lives matter in this city. f >> reporter: in a statement to cbs news, gray's attorney is calling for police to release surveillance video. he's accusing authorities ofon withholding it until, quote, they develop a version of events that will absolve them of all responsibility. jeff? >> glor: thank you, mark. the attorney for a police officer charged with homicide in pennsylvania is trying to block the release of that video. officer lisa mearkle of hummelstown, pennsylvania, was charged after shooting 59-year- old david kassick twice in the back while he was on the grou...

Patients i treat in particular it goes down by 25%. so that's really exciting news. >> glor: but the duration, it did say, what, 16 years, before it is effective in this way? >> correct. patients need to take the aspirin for at least 16 years,e and after they've stopped taking for a period of three or four years, the benefit's no longer there. >> glor: by the way, when you say regular basis, what does that mean? >> so, regular basis means that patients had to take at least two 325 milligram tablets during the week. >> glor: what is it the aspirin is doing? >> so aspirin works through a number ...

Analysis of the root causes. why did it happen? >> reporter: not all of the cases depended heavily on flawed hair match analysis, which will make it more difficult, jeff for some to appeal their cases. >> glor: jericka duncan, thank you. at least 31,000 runners and aea million spectators are expected at tomorrow's boston marathon, which, again, will be under tight security. extra measures were put in place last year after the 2013 deadly bombings will remain in place including surveillance cameras. spectators are discouraged from bringing large coolers or backpacks. d on tuesday, the trial of ...