The rioting youths sparked mayhem on Hollywood Boulevard after the youngsters threw bottles and set fire to cars because they had been denied entry to a Hollywood film première.
The unruly crowd began partying on the streets in protest and the gathering gained momentum when DJ Kaskade organised a 'block party' on Twitter and they refused to disperse.
© Getty ImagesOver-zealous revellers jump up and down on a police car after crowds got out of hand outside a Hollywood film première
DJ Kaskade's Tweets on Wednesday Night
'Today@6pm in Hollywood @Mann's Chinese Theatre.ME+BIGSPEAKERS+MUSIC=BLOCK PARTY!!! RT!'
'EVERYONE CHILL NOW!!! The block party has officially been shut down! BUT THIS IS TOO CRAZY AND WE NEED TO BE SAFE!'
'I AM REALLY CONCERNED FOR EVERYONES SAFETY AT THIS POINT! PLEASE RELAX'
'EVERYONE NEEDS TO GO HOME NOW! I DON'T WANT THIS TO REFLECT BADLY ON EDM OR WHAT WE ARE ABOUT. BE RESPECTFUL AND CHILL OUT!!!'
© unknownHundreds gathered outside Grauman's Chinese Theatre before the crowd turned violent
She said officers who first responded tried to disperse the crowd, but people refused to leave and began throwing objects and vandalising cars
Captain Andy Smith told the Los Angeles Times the disturbance began when fans who tried to attend the première of a film about the Electric Daisy Carnival rave were turned away.
Smith said the première was by invitation only, but many tried to crash the event.
© The Associated PressPolice hold back the crowd that had gathered for the showing of a film about the Electric Daisy Carnival rave
© The Associated PressPolice were called in after trouble flared among the crowd of film fans
© The Associated PressStanding: Los Angeles Police officers near the intersection of Hollywood Boulevard and Highland Avenue, left, and a couple, left, wait at the intersection after an unruly crowd threw rocks and bottles at police cars
The gathering gained momentum after the DJ tweeted: 'Today@6pm in Hollywood @Mann's Chinese Theatre.ME+BIGSPEAKERS+MUSIC=BLOCK PARTY!!! RT!'
As they tried to control the crowd, the LAPD was forced to shut down a large section of Hollywood Boulevard, causing massive traffic problems.
Ravers refused to leave the area and started fighting and throwing bottles. A police car was also set on fire, it was reported.
© The Associated PressWaiting: A police car is parked at the intersection of Hollywood Boulevard and Highland Avenue
© ReutersPolice were called to the intersection of Hollywood Boulevard and Highland Avenue after the chaos erupted, but it didn't deter some revellers
© ReutersOfficers on bikes were also called on to quell the trouble in Hollywood last night
'EVERYONE NEEDS TO GO HOME NOW! I DON'T WANT THIS TO REFLECT BADLY ON EDM OR WHAT WE ARE ABOUT. BE RESPECTFUL AND CHILL OUT!!!' he wrote.
Ravers on the streets also tweeted about the chaotic scramble.
Jessica Fleming wrote: 'LA is out of cntrl LAPD:Officers have been shooting @ crowds w/bean bags & the crowds have set fires.Police cars vandalised.'
Clinton Sparks added: 'Man a riot just broke out @p this EDC premiere here in LA.. Cops shooting rubber bullets @ kids #NoSwag We just want to have an Awesome time.'
© NBCIn line: Police fired rubber bullets at a big crowd of young ravers after the rioting youths sparked mayhem
© NBCRiot: Authorities were called after the youngsters threw bottles and set fire to cars
what will happen when TSHTF?