DYFED-Powys Police is appealing for information about suspicious fires at two properties on Larch Road, Mount Estate, Milford Haven.
The first fire was reported to police at 7.45pm on Saturday, October 8.
The second was reported shortly before 3pm on Friday, October 14, and the third at around 7pm yesterday (Wednesday, October 19).
On each occasion minor damage was caused and nobody was injured.
Inspector Alan Millichip, said: “We are treating these incidents very seriously.
"We believe they have been started deliberately and I am appealing to anyone with information to come forward.
"Any information you provide will be treated in the strictest confidence."
He added: “We have increased high visibility patrols in the area and these will continue.”
Anyone with information is asked to contact Dyfed-Powys Police on 101.
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