Gardai investigating the sudden death of a Donegal teenager are seeking the public's assistance.

17-year-old Tory Johnston collapsed at a nightclub in the early hours of Wednesday morning.

A short time later she was pronounced dead at Letterkenny General Hospital.

Letterkenny Gardai are looking to speak to anyone who was in Voodoo nightclub in the early hours of the 15th of July, to contact them in confidence.