KINGSTON SPRINGS, Tenn. -- The man who's been repeatedly breaking into an elementary school in Cheatham County may have a partner in crime.

Video: Police Think Cheatham Co. School Burglaries Linked | Video Shows Man's Multiple Break-Ins At School

Kingston Springs Elementary has been hit three times by the same guy. Now another school has been hit -- Harpeth High School -- and the cases have a lot of similarities.

"The (man) forces entry to the rear of the school," said Officer Jeremy Vaughn.

The man protects his face and holds his hands up to block the watchful eye of cameras all over Harpeth High.

"He's very comfortable being here," said Vaughn. "It's apparent that's he familiar with the school."

At 3 a.m. Friday, the man made his way through the school without skipping a beat. He tries to pry open a vending machine. He breaks a window to get into the school cafeteria and another to get into the cafeteria manager's office in search of cash, police said.

The case sounded awfully familiar to police, as the break-in was similar to three they've had at Kingston Springs Elementary. And each time, police said, the thief seemed to know there is no alarm.

"He's not in a hurry. He was here for over an hour, takes his time. He's not looking over his shoulder," Vaughn said.

Police said they originally thought the thief that hit at Harpeth High was the same person that struck a nearby elementary school three different times, but now they say they think it's a different person likely working with the other one for the same goal.

"They are going after quick cash, whatever they can get," said Vaughn.

Police said the high school thief seems thinner.

Their hope is someone will notice black tennis shoes with the white strip or the duffle bag the man stole from the school.

The elementary school thief wore a Minnesota Vikings jacket. Police think both men are located close to their targets because they walked.

The school is assessing the damage, but police said the thieves are definitely doing more damage than the money they are actually getting.

They may offer a reward for information that leads to an arrest.