(AP) — San Francisco health officials suspect the gummy candies that sickened 19 people — including a 6-year-old — at a birthday party contained edible marijuana.

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Final lab results weren’t available Monday, but officials say some of the hospitalized patients tested positive for THC, the main psychoactive ingredient in marijuana.

Thirteen of the patients were 18 or younger. The youngest was 6. They were hospitalized Saturday, and all had been discharged by Monday morning.

The patients’ symptoms were consistent with the effects of edible cannabis, including rapid heart rate, high blood pressure, dilated pupils, dizziness, light-headedness, nausea and confusion.

Dr. Tomas Aragon, health officer with the San Francisco Department of Public Health, said the event could serve as a warning about the dangers of edibles, which can be extremely potent. It’s also hard to control the proper dosage, Aragon said.

“A situation like this, where they were consumed by unsuspecting people, and many children, is greatly concerning,” he said.

Officials do not know where the candies came from, he said.

The quinceanera celebration was hosted by a company in Oakland, California.