Unusual sounds have been heard from cockpit recordings of the crashed Russian airliner’s black box, Russian media reported on Wednesday. The sounds were heard at the moment the passenger plane crashed in Egypt's Sinai Peninsula on Saturday.
"Before the moment of the disappearance of the aircraft from radar screens, sounds are recorded which are not characteristic of a normal flight," Interfax quoted an unnamed security source in Cairo as saying.
The news comes a day after US intelligence detected a "heat flash" aboard the crashed plane. A US infra-red satellite reportedly detected the "heat flash" and an official said the US intelligence community believes the heat wave could have been the end product of an explosion within the plane, possibly that of a fuel tank or a bomb.
The US provided satellite imagery also ruled out a surface-to-air missile attack, debunking DAESH's claim that it downed the plane with such a missile.
Analysis of the black box recordings will possibly be the most important step towards determining what exactly happened. The box is reportedly in good condition and could bring officials closer to finding out how the jet came crashing down.
Russian officials said previously that the plane may have broken up in midair, thus establishing the possibility of a bomb being on board.
Kogalymavia or Metrojet, is a small Russian airline in where officials have stressed was in excellent condition, and only an ‘external factor’ could have caused the crash.
"We exclude technical problems and reject human error," Alexander Smirnov, an official at the airline, told a news conference in Moscow, as he discussed possible causes of the crash. "The plane was in excellent condition," he added.
Both Egyptian and Russian authorities have strongly dismissed claims by DAESH’s affiliate, which said any rocket claims by DAESH were nonsense.
"When there is propaganda that it crashed because of ISIS (DAESH), this is one way to damage the stability and security of Egypt and the image of Egypt," said the Egyptian President Abdel Fattah el Sisi.
Russia's Civil Protection Agency’s deputy head Vladimir Stepanov, spoke to Russian media over the search and rescue missions around the plane debris. "We will do this work every day until all the dead and their belongings have been brought back,” Stepanov said.