Egypt plane crash investigators "90% sure" the explosion heard on the black box recording of the Russian flight was a bomb, a member of the investigation team told Reuters.
A memorial service for the 224 victims of the crash was be held in St Petersburg today.
The Egyptian Civil Aviation Minister has told a press conference debris from a passenger plane that crashed in Sinai last week stretches over a wide area more than 13km in length.
He said this was "consistent with an in-flight break-up" but noted that some parts of the wreckage were still missing.
Speaking during a live press conference he also said there was not yet enough evidence to identify what had caused the crash but information taken from flight recorders showed the plane lost contact with the ground just 23 minutes and 14 seconds after takeoff.
Terrorists would be able to bypass the wand-like devices being used to scan luggage in Sharm el-Sheikh, an expert has claimed.
Intelligence showed a "significant possibility" that the crashed Russian passenger jet was brought down by an explosion, ITV News was told.
As flights from Sharm el-Sheikh to the UK are delayed over bomb fears, we review what is known about the Egyptian plane crash tragedy.