Egypt's prosecutor general has agreed to allow a Russian government agency to participate in investigating what caused a Russian passenger plane to crash in Egypt's Sinai peninsula, according to a state-owned newspaper.
The North Sinai prosecution office summoned air and ground traffic control officials for questioning over the incident, and ordered a technical team from the Civil Aviation Ministry to analyse the contents of the plane's black box, the newspaper added
Russia's Investigative Committee is also checking fuel samples from the last refuelling stop of the airliner, according to the RIA news agency.
The fuelling stop was in the Russian city of Samara.
The plane that crashed was an Airbus A321, operated by Russian airline Kogalymavia under the brand name Metrojet.
Spokesman Vladimir Markin said investigators are questioning people who were involved in preparing the aircraft and its crew, and carrying out searches at Moscow's Domodedovo airport, where the airline that operated the plane is based.
Earlier in the day the committee said it had opened a criminal case against the airline.
RIA earlier said the Investigative Committee's case had been brought under an article regulating "violation of rules of flights and preparations for them".
Interfax reported Mr Markin as saying that the case had been brought under Article 263 of the Criminal Code: "Violation of the safety rules for movement and exploitation of air, sea or internal water transport".
Mr Markin also said that a group of investigators and crime experts had been formed and would head to Egypt.
"They will operate in agreement with the competent organs and together with the representatives of the Republic of Egypt in accordance with the norms of national and international law," Mr Markin said, according to Interfax.