SAN FRANCISCO — The bodies of three men found dead outside a high school in a historic San Francisco neighborhood this week showed the presence of methamphetamine, cocaine and fentanyl, a city public health official said Friday.

Department of Public Health spokeswoman Rachael Kagan said that a glass pipe found at the death scene also had traces of the drugs. Preliminary test results suggest the methamphetamine was likely laced with fentanyl and acetyl fentanyl, Kagan said.

A security guard found the men outside an elite private high school in San Francisco’s Haight-Ashbury neighborhood on Thursday, prompting health officials to alert the public of the dangers of buying street drugs potentially spiked with fentanyl.

Fentanyl is a cheap and potent synthetic opioid that is stronger than heroin.

Kagan said more toxicology tests will be done to confirm the results.

She said a cause of death for the men, who were all in their 30s, has not been determined.

The department says drug users should carry naloxone to reverse an overdose and that people should take a tester dose to make sure the drugs are not spiked.

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