Justin Bieber is being investigated for alleged reckless driving, after witnesses claim the pop star was speeding in his white Ferrari in their gated community in Los Angeles.

Bieber is alleged to have driven at motorway speeds in a 25mph zone, according to police spokesman Steve Whitmore.

The Canadian-born teen was seen to have been speeding by Keyshawn Johnson, a former professional American football player, who was outside with his three-year-old daughter when Bieber drove past.

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Johnson followed Bieber to his home and told him he wanted to talk about his reckless driving, but Bieber went into his house without speaking to Johnson, Whitmore said.

When police responded to two calls about reckless driving in the neighbourhood, they were also turned away from Bieber’s door.

Whitmore said: “His security detail said he declined to talk to us based on the advice of counsel.”

Police interviewed two witnesses, including Johnson, and wrote up their report.

“Their eyewitness testimony to our deputies was definitive — not only the speed, not only the vehicle, but Bieber was sitting and driving in the driver's side seat,” Whitmore said.

Deputies plan to send a reckless driving report to the Los Angeles County District Attorney's Office to consider filing misdemeanour charges in the next week or two.

Prosecutors are also looking at whether to charge Bieber for battery in a separate incident involving a neighbour, who complained the pop-star attacked and threatened him.

“We take this very seriously and if this actually did occur, which it appears that it did, it is unacceptable behaviour from anybody, anywhere, anytime,” Whitmore said.

The incident comes a week after the pop star hit back at critics at the Billboard Music Awards, saying: “Basically from the heart I really just want to say it should really just be about the music, about the craft, about the craft that I’m making.

“This is not a gimmick, and I’m an artist, and I should be taken seriously. And all this other bull should not be spoken of.”

Bieber's publicist did not immediately return a call for comment. Johnson declined to comment via ESPN, where he now works as a TV commentator.

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