France's Transport Minister says it is likely "many" French passengers are aboard the missing Air Algerie flight.
Burkina Faso and Algeria are both former French colonies.
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The foreign secretary's suggestion last week's bombing of an aid convoy might constitute a war crime prompted an angry response from Moscow.
Goals from Charlie Austin, Dusan Tadic and James Ward-Prowse consigned Slaven Bilic's men to their fourth straight Premier League loss.
Showers will continue in the north and west, heavy in places.