Gardaí have launched an investigation after a young man was found dead in a flat in St Johnston in the early hours of Monday morning.
Three men and a woman were also hospitalised in the incident and are being treated at Letterkenny General Hospital.
All five are believed to be in their late teens or early 20s. Gardaí do not believe foul play is involved.
A Garda spokesman said ambulance control received a call to attend the scene and one man aged in his early twenties was found dead when paramedics arrived.
A forensic examination of the scene is being carried out by investigators .
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