COLUMBUS, Ohio (AP) _ A car shot in the hood this week is connected to a series of highway shootings that have targeted cars, school buses and buildings, investigators said Wednesday.

Investigators have connected 19 shootings on or near a stretch of Columbus-area highway since May. One of the shootings, in November, killed a car passenger who was on her way to a doctor's appointment.

The latest shooting occurred Sunday on Interstate 270, which encircles the city. The driver reported that a bullet hit the car's hood, then struck and cracked the windshield. The driver wasn't hurt.

Franklin County Chief Sheriff's Deputy Steve Martin said investigators found bullet fragments but could not immediately link the latest shooting ballistically to others.

Ballistics evidence has linked seven shootings. Other shootings have been connected to the case by investigators because they took place on or near a section of I-270 on Columbus' south side.

The last shootings linked to the case nearly a month ago were bullet marks found on two school buses from a district near the highway.

More than 3,000 people have called in tips on the case, and investigators are looking into about 200 people named in the calls, Martin said. Local businesses are offering a $60,000 reward.