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The Russian airline whose plane crashed in the Sinai peninsula in Egypt on Saturday has blamed an "external influence" for the disaster, saying it had ruled out pilot error or a technical fault. The Egyptian president, Abdul Fattah al-Sisi has dismissed a claim from militants linked to the group Islamic State that they brought the plane down. Officials in Moscow say both of the aircraft's black boxes have been located and are in "good" condition. Professor Scott Johns, a former commercial and US Air Force pilot, gives us his insight into the investigation and the commercial repercussions.

In a new blow for Volkswagen, US authorities now say they have found evidence that the company used software to cheat air pollution tests in luxury diesel vehicles, including Porsche. VW has denied this, but after posting nearly 3.5 billion euros in losses just last week. Is this the nail in the coffin for VW? We speak to Robert Wright, US Industry correspondent for the Financial Times

A few years ago, if you wore anything on your wrist it was probably either a piece of jewellery or a watch. Not any more, bracelets these days are a far more technical affair. Digital displays now can keep track of our every movement. Devices like the Fit Bit and the Apple Watch monitor not just how many steps we take but even how fast our heart is beating and how much fat we are lugging around. Good news, you might think, in this age of sugary diets and increasingly sedentary life-styles. But, Lucy Kellaway of the Financial Times is not so sure.

(Photo: debris of the A321 Russian airliner lie on the ground in Sinai a day after the plane crashed. Credit: AFP)