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Federal Bureau of Investigation

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Ryan Chamberlain, the San Francisco man suspected of possessing explosive materials, is believed to have sent a note to his friends and associates calling his struggles "insurmountable"

Ryan Chamberlain, the San Francisco man suspected of possessing explosive materials, is believed to have sent a note to his friends and associates calling his struggles "insurmountable." In the note, he complains about breaking up with a girlfriend and says he "scoured the Internet absorbing fuel for morbid fantasies." John Blackstone reports.

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The FBI has issued a nation-wide alert for Ryan Kelly Chamberlain after a raid of his San Francisco apartment produced a cache of explosive materials and components for bomb-making. Chamberlain is on the run and presumed to be armed and dangerous

The FBI has issued a nation-wide alert for Ryan Kelly Chamberlain after a raid of his San Francisco apartment produced a cache of explosive materials and components for bomb-making. Chamberlain is on the run and presumed to be armed and dangerous. Bob Orr reports.

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At least three people are dead after a gunman opened fire at a Jewish community center and an assisted care facility near Kansas City. Police have a person of interest in custody and the FBI has been called in to assist the investigation.

At least three people are dead after a gunman opened fire at a Jewish community center and an assisted care facility near Kansas City. Police have a person of interest in custody and the FBI has been called in to assist the investigation. Anne Marie Green reports.

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A government reports says Russia refused to give the FBI crucial information about Tamerlan Tsarnaev, a Boston marathon bombing suspect

A government reports says Russia refused to give the FBI crucial information about Tamerlan Tsarnaev, a Boston marathon bombing suspect. The Russians did not reveal at the time Tsarnaev talked about Jihad with his family. CBS News national security analyst Juan Zarate discusses if disclosing the information could have prevented the bombing with the "CBS This Morning" co-hosts.

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At a news conference on Tuesday, the Rev. Al Sharpton addressed his role in assisting a joint FBI-NYPD investigation in the 1980s. Sharpton said he was threatened by "music industry goons" years ago and went to the government for protection

At a news conference on Tuesday, the Rev. Al Sharpton addressed his role in assisting a joint FBI-NYPD investigation in the 1980s. Sharpton said he was threatened by "music industry goons" years ago and went to the government for protection.

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