A new drone surveillance system can spot when someone in a crowd is acting violently. It uses artificial intelligence and is going to be tested at a university festival in India later this year.
The system assesses the way each person in a crowd is standing via two cameras on the drone. Currently it can recognise punching, stabbing, shooting, kicking and strangling.
However, once the technology goes on sale, whoever buys it will be able to input their own definition of a violent act, says Amarjot Singh at the University of Cambridge, who built the system with two colleagues based at science institutes in India.
Read more on New Scientist