The Air Accidents Investigation Branch say two seat cushions which have individually washed up in Normandy are likely to have come from the plane carrying missing footballer Emiliano Sala.
A French journalist has tweeted pictures believed to be of the cushions.
Part of a cushion was initially found on a beach in Surtainville on Monday. A second cushion was then discovered in the same area later on that day.
The AAIB has identified a priority search area of approximately four square nautical miles and is now planning to conduct an underwater seabed search for aircraft wreckage at the weekend.
This is expected to take up to three days.
The Piper Malibu plane lost contact with air traffic control near Alderney last Monday evening.
Both the AAIB and private search are liasing closely to maximise the chance of locating any wreckage.
More to follow.