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Omar Mateen was a member of the mosque but did not regularly attend, although his family did, said Wilfredo Arm Ruiz, a spokesman for the Council on American-Islamic relations.

Schreiber could also be charged with a civil rights violation as the investigation continues, according to the FBI. It is unclear if there were any co-conspirators in the incident, police said.

ABC News' Catherine Thorbecke contributed to this report.

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