Two more cases of bird flu confirmed in Norfolk

Strict measures have been imposed in an "avian influenza prevention zone" across Great Britain

Two more cases of bird flu have been confirmed at large commercial poultry premises in Norfolk.

The Department for Environment, Food and Rural Affairs (Defra) said the H5N1 virus was confirmed near Attleborough and at another site near Feltwell on Friday.

A 3km (1.9-mile) protection zone and 10km (6-mile) surveillance zone has been declared around both sites and all poultry would be humanely culled, Defra said.

Bird flu is caused by a virus that infects birds and sometimes other animals, including foxes, seals and otters.

Earlier in the week, a case was confirmed at a farm housing thousands of turkeys near Wells-next-the-Sea.

On 31 October, the virus was also confirmed at a large commercial poultry unit near Ormesby St Margaret.

From Thursday, Defra introduced strict measures in an "avian influenza prevention zone" across Great Britain.

It said by law, strict biosecurity and hygiene rules must be followed to prevent bird flu and stop it spreading.

The measures have been put in place for keepers with more than 50 birds and any sellers of poultry products.

Defra said the risk to the public was very low, but people should not touch or move any dead or sick wild birds.