At least one of the children later tested positive for fentanyl, officials said. An investigation was launched in to the source of the pills.

At least one child tested positive for fentanyl after three children at a daycare and preschool facility in Victorville appeared to have ingested unknown pills, authorities said Thursday. Deputies with the San Bernardino County Sheriff’s Department were first sent to La Petite Academy on Bear Valley Road after a school employee found blue pills inside a classroom.

A child tested positive for fentanyl after ingesting mystery pills that were reportedly found at a day care in Victorville, California.