A Dunkin’ Donuts employee at an Oakton, Va.-area store allegedly gave a group of teens donuts tainted with a bleach spray, Fairfax County police said.

The teens ate some of the donuts, but were not sickened and alerted authorities, police said.

The incident took place on Monday night, police said. The employee had previously given the teens donuts that would have been discarded at the close of business, and on that day the teens came back for more.

The employee initially refused several times, but then told the teens to return later and he would give them some donuts, police said. Before handing the donuts over, the employee allegedly sprayed them with a cleaning solution that contained bleach.

The teens ate anywhere from a few bites to a whole donut, before realizing they were tainted. They then contacted police.

Charges have not yet been filed in the case, but police said the investigation remains ongoing.