He says some of the men wore bandannas that covered all but their eyes.
Juhasz, who has lived in the neighbourhood for more than 20 years, said the park was packed with families and tourists when the shots were fired, causing mass panic in a normally safe location.
Police did say that they believe this was a targeted shooting and that there is no imminent threat to the public in the area.
Breaking - 3 people shot at Dolores Park in SF. Later on they added that they were "on the scene investigating a shooting that occurred".
A woman sitting in the park told the Associated Press that she heard a burst of gunfire before seeing person running while holding a gun.More news: Manila says can not prevent North Korea attending ASEAN
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Antonia Juhasz says the park was packed with families and tourists Thursday and that she started yelling, "It's actually a gun, it's actually a gun!" to get people's attention. "All are being transported to the hospital", the department tweeted.
Police say three people were shot at a popular San Francisco park. Anyone with information is being asked to contact the police department.
Officers found three victims after responding to reports of a shooting just after 3 p.m.in the Mission District park. Police gave no other details.
It's across Mission High School.