Missing Algeria plane: Sandstorm in search area
24 July 2014 Last updated at 17:33 BST
Footage has emerged showing a sandstorm in Gao, Mali, where an Algerian passenger plane carrying 116 people disappeared on Thursday.
Algerian Prime Minister Abdelmalek Sellal reportedly told Algerian radio: "The plane disappeared at Gao (in Mali), 500km (300 miles) from the Algerian border." .
The pilot had contacted Niger's control tower in Niamey to change course because of a storm, officials say.
There had been bad weather for a number of days leading up to the disappearance, as the BBC's Alex Duval Smith explains.