French president Francois Hollande has said all avenues are being discussed after flight AH5017 crashed in the northern Mali desert, killing 116 people.
Nearly half of the passengers aboard the flight were French, many heading to Europe.
Speaking to reporters, Mr Hollande said that France will spare no efforts to find out what had happened.
"There are hypotheses, notably weather-related, but we don't rule out anything because we want to know what happened," the French president said.
Interior minister Bernard Cazeneuve added: "Terrorist groups are in the zone. ... We know these groups are hostile to Western interests."
More top news
Phil Rudd also pleaded guilty to possessing crystal meth and marijuana in a New Zealand court.
Ed Miliband will order an emergency recruitment drive of nurses so an extra 20,000 will be working in the NHS by 2020.
Sir John will give a speech later today saying a Labour-SNP government would be "weak and unstable" and wreck Britain's economic recovery.