A file handout picture taken on November 1, 2015 and released on November 3, 2015 by Russia's Emergency Ministry shows Russian Emergency Minister Vladimir Puchkov (4th L) visiting the crash site of a A321 Russian airliner in Wadi al-Zolomat, a mountainous area of Egypt's Sinai Peninsula. AFP

AFP/ Cairo

Egypt's government said Tuesday it is bolstering security at airports over the possibility that a Russian plane departing a Sinai resort was brought down by a bomb late last month.

"Taking into consideration all possible causes behind the plane crash, including the possibility that it was targeted by a terrorist attack, the Egyptian authorities have enhanced security measures in all airports," the interior ministry said in a statement.

The statement came as an Egyptian minister said a probe had yet to reach any final conclusions about the disaster, in remarks shortly after Russia announced a bomb had brought down the aircraft.

"Until now the (investigation) committee has not yet arrived to any results indicating the cause of the crash," Civil Aviation Minister Hossam Kamal told a news conference.

The plane, flown by Russian firm Kogalymavia, came down shortly after take off from resort Sharm el-Sheikh on October 31, killing all 224 people on board in Russia's worst air disaster.

Egypt's interior ministry said on Tuesday that there was a review of screening measures for passengers and luggage, "and enhancement of search procedures for passengers and workers upon entry into the airport".  

The ministry added "security sweeps" of airplanes would be conducted as well as "reviews of flight crews' security permits".

It is not known how a bomb would have been smuggled on the doomed plane before it set off from the popular Red Sea resort, but there have been suspicions of an inside job.

The interior ministry said in a separate statement on Tuesday that there have been no arrests at the airport over the incident.