MIAMI (AP) - A passenger accused of trying to break into an airliner cockpit during a flight to Argentina had been depressed and may have suffered a panic attack, according to relatives and a psychiatrist who treated the man during the flight. Pablo Moreira Mosca, 29, a bank employee from Uruguay, was arrested Thursday on a United Airlines flight from Miami to Buenos Aires with 157 people on board. He allegedly crashed into a reinforced cockpit door, getting his upper body into the cockpit, before a crew member hit him with the blunt end of an ax and fellow passengers helped subdue him. Dr. Maria del Carmen Pirez Vargas, an Uruguayan psychiatrist on the flight, told The Miami Herald she treated Moreira with an anti-anxiety drug. "At the moment of the incident, the patient broke with reality and with the present," Pirez wrote in a medical report she gave to the newspaper. "He experienced a clastic crisis (mental breakdown), with aggressiveness and a great lack of control." Pirez quoted another passenger who had just attended a marketing seminar with Moreira as saying: "Pablo was under great stress just prior to the flight. He was in a state of shock for 24 hours before boarding the plane." The passenger said Moriera seemed depressed "because he spent a whole day without saying a word." Moreira's sister, Montevideo journalist Gimena Moreira, told the Herald that his boss had asked their brother to meet Moreira when the flight reached Buenos Aires. Gimena Moreira said her brother "gets panicky when he flies, especially when there is turbulence." She recalled an earlier trip when they were traveling together and their plane flew through turbulence: "Pablo gripped the arm rests so hard that they came off." Moreira was unconscious and bleeding from a scalp wound when Pirez reached him during Thursday's flight. She said she gave him the anti-anxiety medication Loxitane. As Moreira gained more awareness, he told her he worked at a Montevideo bank and had been married for two years, she said. Other family members said Moreira's outburst was completely out of character, describing him as a mature and intelligent person who tutored students and enjoyed playing soccer. "Pablo is an excellent person," Maria Balsa, Moreira's sister-in-law, told the South Florida Sun-Sentinel. "He is an absolutely normal person." Moreira was returned to Miami on Friday to face federal charges of interfering with a flight crew. If convicted, he could face up to 20 years in prison and a $250,000 fine. A bail hearing was scheduled for Tuesday.