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German, French and Spanish authorities have agreed to jointly investigate the crash of Germanwings’ A320 passenger plane in the French Alps, German Chancellor Angela Merkel said Tuesday, Sputnik reported.

“Over the past hours I have spoken with French President Francois Hollande and Spanish Prime Minister Mariano Rajoy. We agreed on providing mutual and comprehensive assistance in investigating the causes of the disaster, as well as support to those leading the investigation at the crash site and at airports,” Merkel told reporters.

According to Germanwings, none of the plane’s 144 passengers and 6 crew members survived Tuesday’s crash. The Airbus A320 was heading from Barcelona to Dusseldorf.

Fifteen German teenagers were among the 150 passengers of the Airbus that had crashed in the Alps, the Local Spain reported Tuesday. The teenagers were returning from a school exchange trip in Catalonia, the website said, citing a source at the Giola Institute in Barcelona.

The Airbus 320 that crashed Tuesday was reportedly 24 years old. As of January 2015, aircraft average age of the fleet at Germanwings was 9.2 years, according to the company's website.