More than thirty people have been hospitalized in Nurburgring, Germany, after two lightning strikes at the Rock am Ring music festival on June 6.

In total, “33 people were placed under observation in nearby hospitals”, police from Rhineland-Palatinate said in a statement.

All were reported to be “in good health.”

Tens of thousands of people are expected at the Rock am Ring festival over the weekend, where Foo Fighters are headlining.

Other artists on the line-up include Die Toten Hosen, The Prodigy, Bastille, Jamie T and Slipknot.

Foo Fighters are the headline act for June 7, they are scheduled to be on stage at 22.30.

The Rock am ring festival runs from June 5 to 7.