Three men are recovering in hospital after they became ill during a clinical trial.
Three ambulances, two rapid response vehicles and two advance paramedics were called to the Shandon Clinic in Cork on Friday morning
It is understood 12 men had been undergoing a drug trial at the private clinic when some became unwell.
Three of the men were taken to Cork University Hospital, where they are said to be in a stable condition.
The trial's other participants are thought to have been treated at the scene and are believed to be remaining under medical supervision at the clinic as a precaution.
The clinic, set up in 1990, is located in the city's former University Dental Hospital.
It carries out between 20 and 30 clinical studies on site each year for a range of international clients.