Families of those killed in the Germanwings crash are in the Alpine village where the plane went down to commemorate the dead and bury unidentified remains.

Friday's ceremony in Le Vernet takes place exactly four months after the co-pilot is believed to have intentionally crashed the Airbus 320 into a nearby mountain, killing all 150 people on board. The town sub-prefect, Patricia Willaert, estimates 300 family members are attending. Most of the dead were German and Spanish.

French prosecutors say co-pilot Andreas Lubitz locked the pilot out of the cockpit, then set the aircraft on its doomed course.

Le Vernet's mayor, Francois Balique, says the crash site should be open within two months as a memorial.