Russian and Egyptian authorities have up till now denied any terrorist involvement in last Saturday's plane crash, yet it's this angle that international investigators appear to be following.
The UK on Wednesday said the crash was 'more likely than not' caused by a bomb. The statement comes ahead of a meeting bewteen the British Prime minister David Cameron and Egyptian leader Abdel Fattah el-Sissi on Thursday.
Meanwhile in Paris, President spokesman Stéphane Le Foll told reporters at a press conference that "all assumptions were being investigated, and nothing was being ruled out, including if the crash was caused by a terrorist attack."
Le Foll insisted that consequences would need to be drawn and appropriate security measures put in place.
Britain indeed has already suspended flights to Egypt's Sharm el Sheikh and begun repatriating its tourists. This has raised fears that this once popular holiday destination already hit by years of political turmoil, could be dealt a serious blow.
Islamic state on Wednesday claimed it was behind the downed plane but gave no details.
Russian Airbus 321 crashed on Saturday, killing all 224 people on board.