Local French officials oversaw the quiet burial of unidentified remains from the Alpine crash a year ago of a Germanwings plane flown into a mountain by its suicidal co-pilot.

Bernard Bartolini, mayor of nearby Prads, said the remains were found during the decontamination of the crash site and were buried Thursday in a ceremony attended by himself and officials from Lufthansa, the parent company of Germanwings.

Le Vernet has become a memorial site for those who lost their lives on the Alps mountainside in the distance.

The families of the 150 passengers and crew killed in the March 24, 2015, crash are to attend a ceremony in Le Vernet. Co-pilot Andreas Lubitz was among those killed.

French investigators on Sunday urged new reporting requirements for doctors treating pilots.