What would you make of someone who drives around an empty school parking lot over and over at night?

I’m a custodian at a school and was sitting in my car on break, it was past 9 and everyone else, who had been there for a fb game, was gone other than my two coworkers and I. There was a car that came from the back of the school where the field is. They drove around the parking lot, then left. I then saw that same car repeat this 3 or 4 more times. They would go to the the back for about 3 minutes then leave again, go back to the road and about two minutes later, they’d be making their way back. I think they’ve left now, I haven’t seen them again. I looked out back and there’s no one else. I don’t know what to think.
What would you make of someone who drives around an empty school parking lot over and over at night?
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