Extensive damage was caused during the incident that followed an earlier vandalism attack, police have said.
Strangford MLA Kellie Armstrong said: “I condemn this attack, which happened in the early hours of a quiet Sunday morning.
“A residential area, this attack purposely happened when most people were asleep. If the alarm had not been raised I dread to imagine what could have happened and what we would have woken up to.
“Thankfully the PSNI and NI Fire & Rescue Service were able to contain what could have been a tragic incident. I call on anyone with information to contact the PSNI by calling 101.”