Egypt said it had found no evidence so far of terrorism or other illegal action linked to the crash of a Russian passenger plane in Sinai that killed all 224 people on board on 31 October.
Russia and Western governments have said the Airbus A321 operated by Metrojet was likely brought down by a bomb.
The so-called Islamic State militant group said it had smuggled an explosive on board.
But Egypt's civil aviation ministry said it had completed a preliminary report on the crash and said it had so far found no evidence of a criminal act.
"The technical investigative committee has so far not found anything indicating any illegal intervention or terrorist action," the ministry said in a statement.
The crash hit Egypt's tourism industry, a cornerstone of the economy.
The plane took off from Sharm el-Sheikh, a popular Red Sea resort.
It raised serious questions about airport security with Russia and Britain both suspending flights into Sharm el-Sheikh.
Egypt is facing a two-year Islamist insurgency in Sinai that killed hundreds of soldiers and police.
IS said the bombing was in response to Russian air strikes in Syria.
Reacting to the Egyptian claims, Kremlin spokesman Dmitri Peskov said: "I can only recall the conclusion of our experts and our special services that indicates it was really a terrorist act."