Northern York County Regional Police are investigating separate incidents of vandalism in North York and Jackson Township.
Police said someone punctured the side walls of four tires on three vehicles parked in the 300 block of East Fifth Avenue in North York.
It happened between 1 a.m. and 3 p.m. Sunday, police said.
And sometime between 2:30 and 4 p.m. Saturday, someone used large rocks to damage three mailboxes in Jackson Township, according to police.
The mailboxes were in the 1300 and 1400 blocks of Martin Road and the 400 block of Little Creek Road, police said.
Anyone with information about case is asked to call police at 292-3647, or leave a tip online at nycrpd.org.