Local police are appealing for information after what has been described as an 'unsavoury' incident in Saundersfoot on Monday evening.
Deemed by officers as a 'prank', excrement was put in a carrier bag which was placed on a doorstep of a property in Whitlow and then set on fire.
The persons responsible then ran off leaving the carrier bag alight.
"This incident is one of an unsavoury nature and is particularly dangerous as it could have caused damage to property," a police spokesman warned.
Anyone with any information is asked to contact Tenby police station on 842303.