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CASTLE ROCK, Colo. — The Castle Rock Police Department says homes in a local subdivision have recently been struck by gunfire, but who shot gun or guns is a mystery. On Saturday, police said three houses in the Cobblestone Ranch neighborhood have been struck by bullets during the last three weeks.

The first report was received Dec. 14 regarding a house on Lynn Lane being struck. There have been two additional reports since then: one on Blue Water Circle and another on Esmeralda Drive. The latter incident is believed to have happened Saturday. A resident came home around 2 p.m. to find a bullet had gone through the garage door.

“These are obviously very concerning incidents for our community as well as the Police Department,” said Castle Rock Police Chief Jack Cauley in a statement. “We are fortunate these incidents have only resulted in property damage and that nobody has been seriously injured.”

While there have been three separate reports, police said they do not believe the incidents are intentional.

On Sunday, police said they believe the bullets originated in an area about one mile west of the subdivision. The Denver ATF provided a K-9 team to assist CRPD. A responsible party remains undetermined.

Anyone with information as to where the gunfire may be coming from is asked to contact CRPD at: 720-733-3517. Tips can also be emailed to crimetips@crgov.com