The Islamic State group has said it smuggled a bomb on board a Russian airliner that crashed last month, after discovering a "way to compromise the security" at an Egyptian airport.

The latest edition of its official online magazine Dabiq said IS had initially planned to down a plane belonging to a country from the US-led coalition targeting militants in Iraq and Syria.

The militants decided to instead target the Russian plane departing the Red Sea resort of Sharm el-Sheikh after Moscow began an air campaign in Syria in late September, the magazine said.