Google has commemorated the 66th anniversary of the Roswell incident with an interactive Google Doodle showing an alien crash landing on Earth.

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The so-called Roswell Incident of 1947 has led to conspiracy theorists claiming the US military had captured an alien after an airborne object crashed onto a ranch in Roswell, New Mexico.

Suspicions of extra-terrestrial life were heightened when a press release seemed to suggest a flying disk had been recovered in the crash by a US army base, prompting theorists to speculate that the military had captured an alien aircraft.

The US Armed Forces has always maintained that debris from the crash of a surveillance balloon belonging to their Mogul programme was the only thing recovered.

The Doodle features an alien which users can direct and control to help it complete a series of tasks.