MONTABAUR, Germany — The German pilot believed to have deliberately crashed a plane in the French Alps killing 150 people broke off his training six years ago due to depression and spent over a year in psychiatric treatment, a German newspaper reported on Friday. The story in German tabloid Bild came a day after French prosecutors said they believed Andreas Lubitz, a 27-year-old co-pilot at Lufthansa's budget airline Germanwings, had locked the captain out of the cockpit and steered the Airbus A320 airliner into its fatal descent. Lufthansa Chief Executive Carsten Spohr acknowledged at a news conference on Thursday that Lubitz had broken off his training in 2009 but did not explain why. He said there was nothing in the pilot's background to suggest he was a risk. "After he was cleared again, he resumed training. He passed all the subsequent tests and checks with flying colors. His flying abilities were flawless," Spohr said. Several airlines have already changed their cockpit rules in response to the crash, although Spohr said on Thursday that he saw no need for Lufthansa to do so. Airlines rushed on Thursday to change their rules so as to require a second crew member in the cockpit at all times, hours after French prosecutors suggested a co-pilot who barricaded himself alone at the controls of a jetliner had crashed it on purpose. The United States already requires two crew members to be in the cabin at all times, but many other countries do not, allowing pilots to leave the flight deck, for example to use the toilet, as long as one pilot is at the controls. Airlines including Norwegian Air Shuttle, Britain's easyJet, Air Canada, Air New Zealand and Air Berlin all said within hours that they had introduced a requirement that two crew members be in the cockpit at all times. – Reuters