Police have said it is fortunate no one was killed after a wheele bin was set on fire inside a house in Larne.
The blaze was started at the property in the Fairway area of the town at around 9.15pm on Saturday.
Police and Northern Ireland Fire & Rescue service attended and fire crews extinguished the blaze.
A man and a woman in their 30s were inside at the time but were unharmed.
Inspector Patrick Mullan said: "Residents from a number of neighbouring properties were evacuated as a precaution and, thankfully, there were no reports of any injuries.
"Considerable damage was caused by the blaze and the NIFRS has declared this fire as deliberate so we are treating it as arson.
"This was a totally reckless act and we’re fortunate not to be dealing with injuries or fatalities today.
"An investigation is now and I want to appeal to anyone who was in the Fairway area of Larne last night around 9:15pm and who saw any suspicious activity to contact detectives in Ballymena on the non emergency number 101, quoting reference 1321 of 08/12/18.
"Alternatively information can be passed to the independent charity Crimestoppers on 0800 555 111 which is 100% anonymous and gives people the power to speak up and stop crime."