Shortly before 1.30am it was reported that a window in the property was smashed and what is believed to be a petrol bomb thrown inside.
Police and NIFRS attended and the fire was extinguished.
Nobody was injured in the incident.
Sinn Fein MLA Phil Flanagan has condemned the attack.
Mr Flanagan said:
“This is an outrageous act of vandalism and I would condemn it in the strongest possible terms.
“The Carlton Hotel is of major economic importance in the Belleek area; as a former employee in the hotel, I know this very well myself.
“Those behind acts of this sort have very little to offer our society.
“Thankfully the prompt response of the local fire service personnel ensured that any damage was minimised and we are all very grateful to them for that.”
Police would appeal to anyone who witnessed this incident or with any information to contact CID in Enniskillen on 0845 600 8000.
Or, if someone would prefer to provide information without giving their details, they can contact the independent charity Crimestoppers and speak to them anonymously on 0800 555 111.
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