The sound of an explosion can be heard on the black box recorder of the downed Russian jet, according to reports in France.
The France 2 TV channel quotes an investigator with access to the black box – but the country’s BEA accident and investigation body said it could not confirm his claims.
If correct, the report supports UK intelligence that a bomb was smuggled into the hold of the Metrojet plane that crashed in Egypt last weekend, killing all 224 people on board.
It is claimed that US officials reported chatter between Islamic State leaders in Sinai and Syria about the Egypt plane, and discussions included boasts about taking down an airliner and how it was done.
“They were clearly celebrating,” the US broadcaster NBC reported, citing US officials.