A 19-year-old woman has died in hospital after attending the FOMO music festival in western Sydney.

Police say the Central Coast teenager was taken from the Parramatta Park event to Westmead Hospital about 6pm on Saturday, and died later on Saturday night.

The circumstances of her death are being investigated and police are appealing for anyone with information to come forward.

An estimated 11,387 attended FOMO, with officers searching 146 people and finding 54 of them with drugs.

Another 23 were ejected, mostly for intoxication, while 28 were refused entry, police said.

More to come

AAP