The Egyptian authorities have reportedly interrogated airport workers and staff at Sharm el Sheikh Airport over the Russian plane crash incident.
On 31 October, a Russian Metrojet Airbus A321 from Sharm el-Sheikh to St Petersburg crashed, killing all the 224 passengers on-board.
Though the incident has been linked to an act of terrorism by intelligence agencies, evidence gathered so far does not indicate it to be a hostile act.
The interrogation follows after Egyptian officials said that 'a mysterious sound was heard on the final second of the cockpit recorder,' reported The Wall Street Journal.
The Egyptian Government is now exploring the possibility of airport workers being allied to the terrorist attack.
The publication has further cited a person close to the investigation as saying that the Egyptian investigators could not find evidence of a technical problem with the jetliner.
Meanwhile, the Egyptian authorities cancelled the UK flights last week from landing at Sharm el-Sheikh Airport, aborting the efforts to transport stranded British citizens back to their country.
The Telegraph has reported that 'British package holidays directly to Sharm el-Sheikh may not resume until next July.'
Egypt has a history of security lapses at its airports. Being a tension-prone area, some airlines have already aborted flying over the Sinai region.
Air France, KLM, Lufthansa, Emirates, Qatar Airways, Air Arabia, Etihad and Flydubai have recently opted to reroute their flights to avoid the airspace.