ALASKA — Police in Anchorage, Alaska, said they had investigated a plot by two young school children to poison a classmate.

The two first grade students had planned to sprinkle what they thought were “poison packets” into a classmate’s lunch, Anchorage police said in a statement.

The packets were determined to be silica, which is used for food preservation, police said.

The plot was not carried out and no criminal charges were filed. Typically, first-grade students in Alaska are six or seven years old.

The children admitted the plot to adults and were suspended.

A school resource officer interviewed the girls and determined they intended to harm the other girl, but charges will not be filed.

Silica gel packets, which soak up moisture, are not poisonous.

“I’m not sure what we could criminally charge first-graders with,” police spokeswoman Jennifer Castro said, noting that no parents or other adults were involved. “What ended up happening was the officer took each one of them individually, had a very a serious talk with all of them.”

Administrators and school district psychologists talked to the girls to see if they understood what they were trying to do, whether it was a prank gone wrong, or if they actually meant to hurt their classmate, school district spokeswoman Heidi Embley said.

“All of these things are being discussed, especially since it’s such a young age,” she said.