French military police said Monday they had wrapped up an operation to recover debris from the crash site in the Alps where a Germanwings plane smashed into the mountainside, leaving 150 people dead.

A police source said pulverised fragments of the Airbus A320 were being stored in a hangar near the crash site and clean-up operations were now set to start, nearly a month after the crash that is believed to have been a deliberate act by the co-pilot.