1 killed, 3 hurt in shooting outside 24 Hour Fitness: Brentwood police

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One person was killed and three others were injured in a shooting that stemmed from an altercation at a Northern California gym, police said.

The three people hurt self-transported to hospitals and are expected to survive, Brentwood police told ABC News.

The gunshots rang out just before 2 a.m. outside a 24 Hour Fitness in Brentwood, which is about 55 miles east of San Francisco.

PHOTO: In this screen grab taken from Google Maps Street View, the 24-hour Fitness gym is shown in Brentwood, Calif. (Google Maps Street View)
PHOTO: In this screen grab taken from Google Maps Street View, the 24-hour Fitness gym is shown in Brentwood, Calif. (Google Maps Street View)

The "altercation" began inside the gym, on or near basketball courts, and carried out into the gym's front parking lot where it "escalated," police said.

At least two people pulled out guns and fired multiple shots, police said, citing surveillance video. Several people fled the scene, police said.

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One of the four people shot, a man in his 20s, died at the scene, police said.

No motive is known, according to police, who called it an isolated incident.

Two suspects have been detained but no arrests have been made, police said.

1 killed, 3 hurt in shooting outside 24 Hour Fitness: Brentwood police originally appeared on abcnews.go.com