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On Monday, FBI agents arrested the wife of Omar Mateen, the gunman who last June killed 49 people in a mass shooting at a gay nightclub in Orlando, Florida. CBS News reports Noor Salman is facing charges of obstruction of justice, and aiding and abetting. During interviews following the shooting, investigators began to question how much Salman knew about Mateen's plans, The New York Times reports. She is expected to appear in federal court in San Francisco on Tuesday. Mateen, who pledged allegiance to the Islamic State, was killed during a police shootout at the scene of the rampage.