The Rock am Ring festival in the town of Mendig was hit by two lightning strikes, according to disclose.tv.

Eight people from production teams were injured when the first strike hit the backstage area at around 1am, police said. Organisers later halted concerts and offered visitors shelter in large, lightning-proof tents. Shortly before 4am, lightning hit the festival’s camping area and another 25 people were injured. Police say all of those injured have been taken to hospitals for observation and are in good health.

None suffered a direct hit by lightning. The festival, which runs until tomorrow and features headlines such as Slipknot and The Prodigy, are still going ahead as planned.