HOPKINTON (CBS) —  Hopkinton Police want to know who and why someone would hand out toilet cleaner tablets to trick-or-treaters.

mom made the shocking find over the weekend and brought the tablet to officers. Police say two kids, a six-year-old and a 14-year-old, who were trick-or-treating separately in the downtown area each received tablets in their Halloween bags.

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“Generally the area is Main Street, and those roads off Main Street, both children were trick-or-treating in those areas,” Hopkinton Police Sgt. Joseph Bennett said Tuesday.

The tablet wasn’t disguised as candy. It was in it’s original wrapper.

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Fortunately no kids were hurt.  Police are now trying to find out whether a resident acted out of malice, or whether the incident was a mistake.

Police Chief Edward Lee said he doesn’t want to unnecessarily alarm parents, but he does want to remind them to take a closer look at their children’s candy bags.

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“I know it’s three days later, but still, something might have slipped by,” said Lee. “We just want to be diligent.”