Co-pilot deliberately slams plane in Alps; families ask why

Passengers with moments to live screamed in terror and the pilot frantically pounded on the locked cockpit door as a 27-year-old German co-pilot deliberately and wordlessly smashed an Airbus carrying 150 people into an Alpine mountainside.

The account Thursday of the final moments of Germanwings Flight 9525 prompted some airlines to immediately impose stricter cockpit rules — and raised haunting questions about the motive of the co-pilot, whose breathing never wavered as he destroyed the plane and the lives of those aboard.

"We have no idea of the reason," Marseille Prosecutor Brice Robin said, revealing the chilling conclusions investigators reached after reconstructing the final minutes of the flight from the plane's black box voice recorder. Co-pilot Andreas lubitz's intention was "to destroy this plane."

French, German and U.S. officials said there was no indication of terrorism. The prosecutor did not elaborate on why investigators do not suspect a political motive; instead they're focusing on the co-pilot's "personal, family and professional environment" to try to determine why he did it.

German Chancellor Angela Merkel, whose nation lost 75 people on the flight, said the conclusions brought the tragedy to a "new, simply incomprehensible dimension." Devastated families of victims visited the crash scene Thursday, looking across a windy mountain meadow toward where their loved ones died.