Los Angeles police officers check drivers’ licences before letting shoppers leave the shopping mall parking lot. AP

At least three people were killed and another three were injured during a shooting inside an Oklahoma City bar, while one person died and three others hurt in a similar incident during a drug deal outside a Los Angeles shopping centre. Both the incidents took place on Saturday.

Police said one person was in critical condition and two others suffered non-life-threatening injuries in the shooting around 9pm at Whiskey Barrel Saloon near Newcastle Road and South Roff Avenue in southwest Oklahoma City, KOCO-TV reported.

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The Oklahoma City Police Department tweeted that investigators were at the scene of a "significant incident” in the 4100 block of Newcastle Road.

Police did not have a suspect in custody on Saturday, KOCO reported.

Los Angeles Police Valley Bureau Deputy Chief Alan Hamilton (right) briefs the media. AP

Meanwhile, one person died and three others were injured in a shooting during a drug deal outside a Los Angeles shopping centre, police said.

Multiple suspects shot at each other during what police believe was a dispute during a narcotics deal in a parking lot in the area of Vanowen and Fallbrook in West Hills around 3:45pm, Los Angeles Police Department Deputy Chief Alan Hamilton said.

The deceased man was not immediately identified by police.

Three victims hit by gunfire were transported to a hospital and treated for non-life-threatening injuries. At least two of those may face charges after their release from medical care, Hamilton said.

Three suspects were in custody on Saturday evening and investigators believe the shooting involved gang members, he said.

Police recovered two firearms at the scene, Hamilton said.

Los Angeles police investigate the scene of a shooting in a shopping centre parking lot. AP

"We believe that all of the people involved in this dispute have been identified and we believe we have them either in custody or we have them where we can provide them medical care,” Hamilton said.

An LAPD helicopter spotted a vehicle with windows shot out leaving the scene and tracked the car, Hamilton said.

"That suspect became involved in a hit-and-run traffic collision where they injured someone else and continued fleeing the area,” Hamilton said. "They subsequently switched vehicles and the air units saw them switch vehicles and directed ground units to the location where the suspect was fleeing.”

There was a pursuit lasting two to three minutes before the vehicle pulled over. A female driver and the male suspect who fled the shooting scene surrendered and were taken into custody, Hamilton said.

The person who was injured in the hit-and-run accident was treated for non-life-threatening injuries.