The unnamed girls, aged 18 and 19, were taken from the Pomona event to a nearby hospital but both were pronounced dead shortly after arriving at the centre, the Los Angeles county coroner's office confirms to local news station KTLA.

Autopsies on the girls are expected to be performed this week (begs03Aug15).

Nearly 65,000 concertgoers are expected to attend the two-day festival, which concludes on Sunday (03Aug15) and features performances from The Weeknd, the Chemical Brothers, Fetty Wap, and Chromeo, among others.

This isn't the first time the festival has been marred by a death - last year (14), 19-year-old Emily Tran also died from a suspected overdose after attending the event.