The unmanned aircraft appear to be similar to the CH-901, China's first tactical attack drone and part of a series developed by state-owned China Aerospace Science and Technology Corporation.

The CH-901 is small – just 1.2 metres (3.9 feet) long and weighing 9kg (20lbs) – but it can spend up to 120 minutes in the air and head towards a target at a speed of 150km/h (93 miles per hour) before detonating.

Experts are worried that drone swarms could be used to confuse and overwhelm air defense systems by quickly being able to approach them from multiple angles.

Yeah I would be worried about that too.