JUSTIN BIEBER Paparazzi CRASH After Chasing Him

The cop stopped Justin for tinted windows, knowing that the Nissan would probably stop ... which it did.  Turns out ... the Nissan was being driven by someone in Justin's security detail.

As the cop was speaking to Justin, several paparazzi roared up to the scene.  Two of them in separate cars apparently lost control, hit each other and went up on the curb.

As far as we know, no one was cited.

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