'An outbreak of equine flu has forced all British horse races to be cancelled just five weeks before the world-famous Cheltenham Festival - with vets confirming that vaccinated animals have also been infected by the virus.
The British Horseracing Authority (BHA) is set to decide in the coming hours how long the shutdown will last.
The BHA made the decision to cancel all of Thursday's racing cards on Wednesday night, after the Animal Health Trust confirmed three positive tests from vaccinated horses in an active racing yard.
In an initial statement, the BHA reported that horses from the infected yard had raced on Wednesday at Ayr and Ludlow.
They added that finding the virus in vaccinated animals is a 'cause for significant concern'.
It was later confirmed the yard belonged to Grand National-winning trainer Donald McCain, in Cheshire.
In an update on Thursday morning, the governing body added: 'We will endeavour to issue regular information, but we are still in the early stages of assessing the scale and severity of the outbreak.
'We are working quickly to identify the extent of the infection and will have more information when further test results are returned today. The results from those tests will not be known until this evening.'
Read more: Equine flu outbreak forces all British horse races to be cancelled for a WEEK as vets confirm three vaccinated animals are infected with the virus - amid fears Cheltenham will be under threat too
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