Invasive Asian Hornet threatens pollinating insects in the UK
The Asian hornet was found near Tetbury, Gloucestershire. Work is under way to find and destroy its nests.
The Department for Environment, Food and Rural Affairs (Defra) has set up a three-mile (5km) surveillance zone.
Defra said it had been anticipating the hornets' arrival "for some years" and had a "well-established protocol in place to eradicate them".
Nicola Spence, from Defra, said: "It is important to remember they pose no greater risk to human health than a bee, though we recognise the damage they can cause to honey bee colonies.
"That's why we are taking swift and robust action to identify and destroy any nests."
Read more at BBC News