The second-edition of the World Humanoid Games is under way in China.

The competition, which kicked off on Saturday, will run for five days and has already included a robot running faster than Usain Bolt's 100m sprint world record.

Elsewhere at the event in Beijing, a robot performed Cristiano Ronaldo's iconic 'Siuuu' celebration on the football pitch and droids took part in synchronised marching at its opening ceremony.

Robots have also been competing in events including boxing, high jump, Tai Chi and table tennis.

The BBC's China correspondent Stephen McDonell reports from the country's capital.