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A deadly shooting that killed three people in Seattle broke out after rival gang members started firing at each other, sources claimed.

Families were sent running for their lives after gunfire broke out on Sunday night as a food festival got underway in the city.

Sources said that the shooting was targeted and potentially gang-related, according to local independent journalist Jonathan Choe.

Meanwhile, the Seattle Times reported that multiple people were firing at each other during the bloodbath.

Asked whether the gang unit had been called in, Assistant Police Chief Tyrone Davis said several detectives, including homicide and gun violence reduction units, were on scene.

One person has been detained in connection with the shooting at the Seattle Center, police said, only describing them as a 'young person.' An individual was seen being taken away by cops in the aftermath.

Another suspect is believed to have fled the scene, though there is said to be no ongoing threat to the public, Davis added.

Two people died at the scene, while five people who were injured were treated at the scene by teams who swarmed the festival site a little after 6pm.

Families were sent running for their lives after gunfire broke out on Sunday night at the Seattle Center

A possible suspect is detained by police following the shooting on Sunday evening

Four of those victims - a two-year-old boy, a 23-year-old man and two adult women - were then taken to hospital where one of them died from their injuries.

Two weapons were also recovered from the scene, leading authorities to believe the two suspects were shooting at each other.

One food vendor caught the first shots ringing out in a livestreamed video from the scene, which showed how quickly it descended into chaos.

A man with Hawaiian Honey Cones was seen showing off his product on a live stream when a fellow employee yelled out 'shooting'.

'Shooting, oh s***,' the man taking the livestream video replied, as people, including families with young children, started running.

Several gunshots could be heard in the background as festivalgoers ran for their lives, breaking down a small fence in the process.

The video then ends with the live streamer telling his employee to grab their cash register and tip jar.

Estan Wakonabo said he and his girlfriend were at the festival when he was shoved from behind and he turned to see a rush of people fleeing.

One food vendor caught the first shots ringing out in a livestreamed video from the scene which showed how quickly it descended into chaos

He told the Associated Press: 'People were hiding, were pushing, people were falling on the ground, baby strollers were falling.

'Once I heard a 'pop, pop, pop,' that´s when I knew it was a shooter,' he said.

After he escorted his girlfriend to safety, he returned to the scene to take photos and saw multiple victims on the ground, Wakonabo said.

The annual festival started in 1982 and draws 350,000 attendees over 'three days of food, drink, and community celebration,' according to its website.

In a statement, Mayor Katie Wilson said: 'What happened at the Seattle Center today was an act of horrific violence.

'No one should have to weigh the risk of being shot before attending an event, gathering with friends, or experiencing their city.

'Our first responsibilities are supporting grieving families, caring for the injured, and providing clear and accurate information for the public.'

She thanked first responders, adding: 'Gun violence changes families forever. Its trauma reaches far beyond the people struck by bullets.

'In the days ahead, we will establish what happened and be transparent with the public about what we have learned.'