According to LePoint, an unnamed official close to the investigation has revealed that results of tests carried out on the cockpit voice recorder show the tragedy could not have been caused by either a technical fault or an error by the crew, The Independent reports.

Read alsoU.S. officials point to possible bomb in Russian plane crashA source who had access to black boxes said the distinct sound of an explosion mid-flight could be heard, adding that the motor did not break down prior to it, according to France 2.

Read alsoCameron says A321 crash "more likely than not" caused by bombAlso this afternoon, an Egyptian government official has reportedly told ABC the possibility the flight was brought down by a bomb is now the “most plausible scenario”.

The claim was further validated when Vladimir Putin agreed to suspend all flights to Egypt on the recommendation of the head of Russia's security service.