ST. JOHNS COUNTY, Fla. -- The Florida Highway Patrol is investigating after three tractor-trailer rigs -- one a gasoline tanker truck -- were hit by gunfire on Interstate 95 in St. Johns County overnight.

According to the Florida Highway Patrol, at least one bullet hit a gasoline tanker truck. About 50 gallons of gas were spilled before firefighters could plug the leak.

The tanker truck was driven to a gas station at the state Road 207 exit to wait while its 3,000-gallon load could be transferred to another tanker.

The driver of the tanker told investigators he was southbound near the county Road 214 overpass when saw the gas spraying out of the side of the tanker in his rear-view mirror. He said he saw headlights in the woods shortly before he noticed the leak happened.

Another trucker said he heard a loud bang and pulled over at a rest stop and saw a bullet hole in his door.

Troopers said when the driver pulled over he saw that a bullet had hit his passenger-side door.

Investigators said if the shot had hit the glass, it could have been much worse.

"Higher up, it could've went through the window and struck him. So, it's very dangerous," said FHP Lt. Bill Leeper.

The third trucker, who was driving a UPS truck, pulled over with engine trouble and found an oil pan had a bullet hole in it.

"It's very strange to have three vehicles struck like that accidentally, so more than likely it was intentional," said Leeper.

All three big rigs were going southbound just past the state Road 16 exit when they were hit. FHP investigators have recovered some bullet fragments and believe a high-powered rifle was used in all three incidents.

FHP is expected to send the bullet fragments to a lab to find out the caliber of bullets and from what kind of weapon they may have been fired.

A St. Johns County Sheriff's Office helicopter searched the area looking for whomever was firing the shots, but they did not locate anyone. They said the area has been used for hunting, and they're investigating the possibility that shootings were accidental.

"It may have been some stray bullets from some illegal hunting in that area or if it could have been done on purpose," Leeper said.

Without knowing the intentions of the shooter, investigators urge all drivers to be on the lookout.

"Be aware of your surroundings and if you see anything suspicious, note that in case something does happen," Leeper said.