Russian President Vladimir Putin has said that the investigation of debris found in the wreckage of the Russian A321 passenger jet that crashed over Egypt’s Sinai Peninsula on October 31, killing all 224 on board, has entered its final stage.

The investigation of material from the Russian A321 passenger jet that crashed over Egypt’s Sinai Peninsula on October 31, killing all 224 on board, has entered its final stage, Russian President Vladimir Putin said Monday.

“We are at the final stage in investigating the materials,” Putin said during a meeting with Italian Prime Minister Matteo Renzi in Turkey.

On October 31, a plane operated by the Russian Kogalymavia airline crashed in the Sinai Peninsula en route from the Egyptian resort of Sharm el-Sheikh to St. Petersburg. The tragedy is the largest civil aviation disaster in Russian history.

Shortly after the crash, Moscow and Cairo reached an understanding on the investigation, and an international Egypt-led probe was launched. The investigative committee comprises Egypt, Russia and France, assisted by Ireland and Germany.

According to UK and US media, their intelligence agencies intercepted communications in Sinai hinting that a bomb was planted on the plane before takeoff. Investigators have repeatedly said that all scenarios currently remain possible.

Russia, along with many other countries, suspended flights to Egypt following the accident.