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Brian Ludmer, a Calabasas High School teacher, remaines in fair condition at Ronald Regan UCLA Medical Center with a gunshot wound to the leg.

His family declined to comment and asked for privacy, hospital officials said.

The FBI was still looking into Mr. Ciancia’s past, but investigators said they had not found evidence of previous crimes or any run-ins with the TSA. They said he had never applied for a job with the agency.

• Associated Press writers Alicia Chang and Gillian Flaccus contributed to this report.