(CBS) — Lollapalooza  ended about an hour early Thursday night, due to stormy weather.

Chicago police supervised Grant Park’s evacuation, which began around 9:10 p.m. The festival had been slated to end at 10 p.m.; headlining acts such as Lorde were not able to perform full sets.

An estimated 100,000 people were in the park at the time of the cancellation. Nearby underground parking garages were serving as shelters.

The threat of rain and storms loomed all afternoon and evening.

“We are disappointed to have to end today’s performances early, however our first priority is the safety of our fans, staff and artists,” said Sandee Fenton, Director of Publicity for C3 Presents, the promoter behind Lollapalooza.

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