Screams and Chaos As Four Dead, 15 Hurt In Mass Shooting At Festival

Police are hunting a second gunman after a mass shooting at a food festival in California, with at least four people dead and more than a dozen injuries in the rampage.

Police and ambulance crews responded to the active shooter situation at the Gilroy Garlic Festival, an hour south of San Francisco in California's north, around 5.40pm on Sunday evening (local time, Monday AEST).

Initial reports said at least 11 people were shot. A local councilman soon stated three people have died, with Gilroy police later revising the victim toll to four dead, 15 injured.

One of the dead is said to have been a suspected shooter. Police said they are still hunting for suspects, with witnesses claiming there may have been two people shooting.

Officers were on the scene within one minute of the gunfire beginning.

People flee as gunshots ring out at the garlic festival. Photo: supplied

Witnesses said the shooting sounded like "firecrackers". Video of the incident shows people screaming, running and hiding as what sounds like gunfire rings out through the festival grounds.

Footage captured by festival attendees shows numerous people bleeding from wounds. It is unclear whether these injuries were related to the shooting or were sustained while fleeing the gunshots.

Other witnesses claimed a shooter was dressed in a vest and camouflage attire and was shooting in "every direction".

“Scariest moments of my life,” a person tweeted in the aftermath of the shooting.

As of time of writing, the situation was still considered active by local police. President Donald Trump tweeted that the shooter was still at large.

Californian senator and Democratic presidential candidate, Kamala Harris, called the incident "horrific".

California's governor, Gavin Newsom, also called the situation "horrific" and praised police efforts.

More to come.