PLANO (CBSDFW.COM) – Some residents in Plano are feeling no love for whoever is spray-painting hearts throughout one neighborhood.

Angela Knautz and her kids passed as many as 15 of the graffiti markings while on a bike ride Monday.

“I saw the first one and I thought ‘wow, that’s weird’ then I saw two, three more,” the mother said.

Someone’s spreading the universal sign of affection on the brick walls that protect neighborhoods along Hedgecoxe and McDermott Roads.

“I just thought, ‘what a shame’ and how expensive its going to repair that,” Knautz thought out loud.

To some younger residents the hearts seem like a harmless prank. “I think its kind of cool,” said Knautz daughter, Sophie.

Ironically, other resident’s say whoever is behind the vandalism is actually heartless.

“It was upsetting that they would do that to our properly and there’s no one to take care of it,” said resident Carrie Shahan.

A heart isn’t exactly the kind of tough, street symbol you would associate with tagging or the unauthorized writing or drawing on a public or private surface, but police say its possible the graffiti could be gang related.

“At this point we really don’t know what this symbolizes,” said Officer David Tilley with the Plano Police Department. “We don’t know if someone is out there drawing random hearts or if there is a meaning behind it.”

City workers have been applying a special chemical to remove the red and green paint, but visible outlines remain.

Police are investigating whether the same vandals caused $5,000 in damage to a nearby neighborhood pool and spray-painted the word “sin” on the walls this past weekend.