It's being reported that one of the most dangerous breeds of jellyfish has been spotted in the sea near Sandycove, South County Dublin.
The Lions Mane has hundreds of tentacles capable of causing severe stings to humans.
Dún Laoghaire-Rathdown County Council took to Twitter to bring the creature to people's attention, advising swimmers to stay out of the water at Seapoint.
— dlrcc (@dlrcc) July 13, 2017
Signs have been erected in the Life Guard patrolled areas at Seapoint.
"As an added precaution the life guard warning flags are on red and will remain there till further notice."
Life Guards are remaining vigilant and the authorities are asking swimmers to act the same.