SEYNE-LES-ALPES, France - Crews are getting set for a second day of searching on an Alpine mountain side where a German jetliner crashed with no distress call on Tuesday, killing 150 people on board.

Investigators are hoping a black box discovered among the debris will help them figure out what caused the Germanwings flight heading from Barcelona to Duesseldorf to take an unexplained eight-minute dive. French officials said it would be investigated "immediately." Germanwings' parent company, Lufthansa, is, for now, calling the crash "an accident."

Meanwhile, flowers are piling up in front of a Germany high school where 16 of the passengers were 10th grade exchange students. Students gathered for a service, crying and hugging one another over the loss of their classmates.

The majority of victims were European. Germany and Spain are believed to have lost the most lives in the crash. Two of the passengers were Australian. The Japanese government says two of its citizens were on board as well.

According to the French Interior Minister, the planes' black box voice recorder damaged in Alpine jet crash.