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.
More top news
Pregnant women who smoke are more likely to give up if they are given shopping vouchers, new research suggests.
Children are eating the equivalent of seven and a half chocolate fingers for breakfast, campaigners have warned.
Stephen Fry has suggested that the "the patter of tiny feet" may be on the agenda following his wedding to Elliot Spencer.