A private pilot has made an interesting testimony by phone on a French TV.
He was flying a single engine aircraft when he was asked by Marseille Control on 120.55 to look around. He was informed that the last plot of the missing aircraft was at FL60 on a 010 heading in the area he was flying. At that time he was VMC and the weather very good. He climbed to FL60 but could not see anything. He also contacted Barcelonnette airfield to ask if they saw of heard something but the answer was negative.
The accident area is in fact the " Massif des Trois Evêchés ", a high mountain rising up to 2900m. (44.285 6.507).
The weather is worsening now and rain/snow is forecast.