SANTA ANA (CBSLA) — Authorities say they’re continuing to investigate a series of poisonings targeting individuals experiencing homelessness in Huntington Beach.

The poisonings in mid-May impacted multiple homeless individuals who were given food laced with oleoresin capsicum, the Orange County District Attorney’s office said in a news release Friday.

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The ingredient, officials said was “twice as strong as the pepper spray used by police.”

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The individuals suffered seizure-like symptoms, including difficulty breathing, vomiting, and intense mouth and stomach pain. Their reactions were apparently filmed, according to officials.

Several were hospitalized.

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More information was expected to be released Monday at an upcoming news conference.