This article was originally published on KCRA.com

SACRAMENTO, Calif. — Gunfire broke out Saturday night at Howe Park in Sacramento County during an unauthorized gathering promoted online as a “Picnic Day” event, injuring four people and prompting an investigation. As of Monday evening, there have been no arrests made.

The Sacramento County Sheriff’s Office said the event, which drew hundreds of attendees, was marketed as a “Picnic Day” but had no legitimate ties to UC Davis Picnic Day, despite social media posts suggesting otherwise. Deputies were at the park attempting to disperse the crowds when they heard at least 20 gunshots.

Four people, three men and one woman, ranging in age from 21 to 25, were shot and taken to a local hospital. All are expected to survive their injuries.

Investigators are urging attendees to share any videos or information that could assist in identifying the suspects.

“There’s the potential that there is a large amount of video evidence and everything else that people are going to have on their personal phones,” the sheriff’s office said. “We would really urge people to contact us, give that information to assist us in the investigation.”

A vehicle of interest was spotted in Solano County after the shooting. Investigators found a gun in the car, and three people were detained and questioned. However, they have not been arrested as suspects in the case.