At least 12 taken to hospital during 4/20 festival in San Francisco

SAN FRANCISCO (KGO) -- At least twelve people have been transported to the hospital during 4/20 festivities in San Francisco's Golden Gate Park. SFPD is looking into fentanyl as the possible cause of several medical emergencies.

Officials said UCSF is treating two patients who overdosed from an unknown substance. They are both stable and under observation by the hospital.

VIDEO: Bigger crowds expected at SF's 4/20 celebration now that cannabis is legal
EMBED More News Videos

If you think last year's 4/20 celebration in San Francisco was huge, this year will be even bigger now that recreational cannabis is legal.

At this time, officials have not said what condition the other patients are in.

Friends of a man that collapsed told ABC7 News that he was near the stage when it happened, but was awake when paramedics got to him.

Officials said at least 20,000 people were at Golden Gate Park Friday enjoying 4/20. Last year, about 10,000 people attended the event.

Click here for more stories, photos, and video on cannabis.

Copyright © 2020 KGO-TV. All Rights Reserved.