Tires were slashed on at least 15 Toyota Prius cars in Arlington County sometime Sunday night or early Monday, police said.

Police said the vandalism was discovered Monday morning. They said the incidents had occurred across the county, but it appeared that the Cherrydale and Waverly Hills neighborhoods of North Arlington were the sites of the greatest number of the incidents. The Prius is a popular hybrid vehicle.

No motive was disclosed in the vandalism, and it was not clear how many people carried it out. Police said they had no suspects.

Rebecca Longsworth of North Arlington said two tires were slashed on her Prius. Several other hybrids, parked within a few blocks of her car, were also damaged, she said.

The damage to Longsworth’s car was particularly bothersome, she said, because the tires were new.