LUBBOCK (AP) — A federal grand jury has indicted a Florida man on a charge of interfering with a flight crew after his unruly behavior aboard a Southwest Airlines flight led to an emergency landing in Texas.

U.S. Attorney Sarah R. Saldana said 29-year-old Ali Reza Shahsavari of Indialantic, Fla., made his initial court appearance Thursday, two days after his arrest at Rick Husband Amarillo International Airport.

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An indictment says Shahsavari became disruptive during a flight from Los Angeles to Kansas City, Mo., intimidating crew members by screaming profanities and damaging a lavatory.

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Attorney Jeff Blackburn says Shahsavari had a nervous breakdown while on his way to Florida for mental health treatment, calling it “a tragic case of a poor young guy who is mentally ill.”

A detention hearing is set for Tuesday.

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