Tech leaders warn over 'killer robots'

A group of top tech leaders, including British scientist Stephen Hawking and Apple co-founder Steve Wozniak, on Tuesday issued a stern warning against the development of so-called killer robots.

Autonomous weapons, which use artificial intelligence to select targets without human intervention, have been described as "the third revolution in warfare, after gunpowder and nuclear arms," wrote around 1,000 technology chiefs in an open letter.