A man has collapsed during the Aston Villa - Olympiacos semi-final leg for the Europa Conference League.
Emergency services rushed to the scene on the Lower Holte end (L2) and started performing CPR on the man.
Fans were ordered to clear the end so that emergency services could attend to the man, whilst both teams remained inside their dressing rooms.
A black screen was held up by emergency services members they tried to give the individual some privacy.
Fans were ordered to clear the end so that emergency services could attend to the man who collapsed at Villa Park
PA
The man, who appeared to be conscious, was then stretchered off.
It is not yet clear why the man collapsed.
The second half then restarted after a short delay of several minutes.
An announcement was made on the speakers as police rushed up to attend to the incident.
Prince William was spotted in the crowd of tonight's game, cheering on his beloved team
PA
It said: "Could all supporters clear Holte Lower L2 and make sure the gangways are clear."
TNT Sport confirmed a fan had suffered a cardiac arrest and was being taken out to an ambulance.
Sports presenter Jules Breach said: "Just to let you know, the reason that the second half hasn't got underway yet is because there has been a medical emergency in the stands, and there was a sign that went up just behind us that said to clear the Lower Holte L2 area.
"It has now been cleared of all the fans, but there has been a cardiac arrest, and we're hearing that there is going to be a short delay to the second half."
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The Prince of Wales applauds in the stands during the UEFA Conference League semi-final
PA
Prince William was spotted in the crowd of tonight's game, cheering on his beloved Aston Villa.
The Prince of Wales is a self-confessed Clarets supporter and refused to miss out on the big game at Villa Park.
He was seen talking with those around him in the executive boxes in the 42,640-seater stadium.