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the new calls for tougher regulations. > the mysterery at sea. what happened to three experienced american sailors who disappeared without a trace off the coast of mexico almost two weeks ago? a new treatment for melanoma brings promising results. rates of recurrence and death down dramatically and ten years after the boston marathon bombing, how their injuries forged a bond that has withstood the test of time, inspiring america. >> announcer: this is nbc "nightly news" with lest...

at the 25-year-old black motorist last june. the state attorney general saying the officers thought walker was reaching for a gun during a chase. will it ignite new protests? breaking news in kansas city. a homeowner charged with two felony counts after he shot a black teenager who rang his doorbell mistakenly. the prosecutor now saying there was a racial component in the case. growing outrage by u.s. allies after the leak by a national guardsman of those top secret documents, and ...

Now, chinas embassy has previously said that these were not police stations but rather volunteer-run facilities meant to help chinese nationals. no comment today from the chinese embassy. lester. >> gabe gutierrez, thank you. theres growing concern following a series of massive chemical fires and toxic spills nationwide. families who live in impacted communities fear there could be long-term health problems. heres tom costello. >> reporter: from that massive fire in georgia to a chemical spill...