LONDON - Essential web services have come under a simulated attack as European nations test their cyber defences.

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LONDON - The co-founder of the social networking site Twitter, Evan Williams, has stepped down as the CEO, with COO Dick Costolo taking over as the company's new chief executive.

LONDON - Qantas Airline CEO Alan Joyce has rejected as 'outrageous' union concerns over the outsourcing of maintenance of its aircraft, and added that the explosion of the engine on a Qantas flight was most likely a "material failure or a design issue" of the engine.