The co-pilot suspected of deliberately crashing a Germanwings jet into the French Alps on Tuesday has been identified as 28-year-old Andreas Lubitz.

Announcing his details at a news conference on Thursday, Marseille prosecutor Brice Robin said he had no known links with terrorism.

"There is no reason to suspect a terrorist attack," he said.

Asked whether he believed the crash that killed 150 people was the result of suicide, he said: "People who commit suicide usually do so alone....I don't call it a suicide."

Robin said the black-box cockpit recording recovered from the wreckage of the disaster suggested passengers did not realise what was happening until the last moment.