During Firefly Music Festival at The Woodlands in Dover, Delaware this past weekend, a 20-year-old woman died on the campground, according to local authorities.

According to WDEL-FM, police identified the concertgoer as Caroline Friedman from Philadelphia, Pennsylvania. On Sunday morning, officers were called to the camp grounds at 6:30 a.m. and found Friedman unconscious. After being transported to BayHealth Kent General Hospital, she was pronounced dead at 6:55 a.m., police said.

Although the cause of her death is still unknown at this time while her autopsy and toxicology results are pending, Dover police said that foul play is not suspected at this time, The Philly Voice reports.

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As the event unfolded, concertgoers took to Reddit.

Just saw an ambulance do CPR on a girl in North Camping.
byu/ebjazzz inFireflyFestival

Friedman’s death follows the passing of a 35-year-old man at Bonnaroo Music Festival last weekend in Tennessee.¬†This is reportedly the first death at Firefly in its seven-year run. Representatives of the festival have not publicly commented on the incident at this time.

The four-day event, which takes place annually at Dover International Speedway, drew in thousands of music fans. Last year, there was an estimated 90,000 attendees.