Multiple ambulances were called after a woman collapsed in the entrance of the NCP Car Park, in St Stephens Road earlier.
The incident happened near the walkway entrance to the site, where staff at the car park said a woman was found laying unconscious.
An NCP employee, who was at the scene, said: "It happened around 2.43pm.
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"I saw some people giving her CPR while speaking to the emergency services.
"A first responder arrived shortly after and told everyone to clear out, before three ambulances turned up about five minutes later.
"We helped clear the area and shut off the entrance and exit pathway until the emergency services left around 4pm."
This newspaper has contacted the emergency services for any information about the incident.
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