Sheriff's deputies are investigating gunfire in the parking lot outside the Pittsford Wegmans.
The sheriff's office says the store was placed on lockdown as a precaution.
Customers were seen leaving, but the entrance to the parking lot was blocked off.
Investigators are interviewing witnesses, and evidence technicians are processing the scene.
A source tells Bob Lonsberry someone either shot at, or from, a car that was last seen heading up Monroe Avenue toward Brighton.