Police are investigating an incredibly disturbing report that a California high school student made cookies mixed with human remains and passed them out to unsuspecting classmates to eat, local station CBS 13 is reporting.

Several students did indeed eat the cookies handed out at DaVinci High School in Davis, California, that police suspect may have included the ashes of one student’s grandparents.

So far, student testimony is what is leading the police to investigate; the cookies have not yet been tested.

Police say the sugar cookies in question were given to at least nine students.

Many have heard of brownies, cookies, and other sweet treats laced with marijuana making their way to school — baking with pot has been around for decades — but desserts made with human remains is a new and unsettling development.

Davis Police Lt. Paul Doroshov says he’s never come across a case like this.

“No, this is a weird one,” the law enforcement officer told CBS 13. “I have not heard of anyone getting sick or anybody being harmed as far as physically [or] physiologically by this.”

“That’s just gross,” said one Boston-area 19-year-old to LifeZette of the seemingly Halloween-themed cookies.

“And they can’t get those ashes back, even if it’s not dangerous for the kids to eat. People don’t live their whole lives to end up in a bunch of cookies; that’s just wrong and creepy!”

Related: Marijuana Is Hardly the Healthy Alternative to Alcohol Millennials Think It Is

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Police are working to confirm that two high-school students were part of the plan.

Then they must figure out what the possible charges against the culprits would be.

“This is so unconventional, it would take more research,” Doroshov said.

The Davis Joint Union School District issued a statement noting it couldn’t comment on confidential student matters, but that the investigation is ongoing: “This case has been particularly challenging, and we have responded appropriately and in the most respectful and dignified way possible,” they said, noted CBS 13.

“I hope this is just a huge misunderstanding,” wrote one person on Twitter, while another said, “I don’t think they broke any laws.”

Another tweeted, “Mistaken for sugar?”

Ah … that’s doubtful.

See more about the spread of marijuana in the video below.