The singer was suffering from extreme stomach pain.

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Red Hot Chili Peppers frontman Anthony Kiedis was sent to an area hospital hours before a headlining slot at KROQ’s annual Weenie Roast on May 14. Flea made the announcement from the stage at Irvine Meadows Amphitheatre and apologized on behalf of the band telling the crowd at the 16,000-capacity venue that they were “devastated.”

According to a rep for the Los Angeles radio station, Kiedis was taken from the venue in an ambulance suffering from extreme stomach pain. The exact nature of the problem is unknown at this time.

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Weezer ended up closing the show, which was held in Irvine, Calif. Red Hot Chili Peppers were due to take the stage at just after 10 p.m. local time. At 10:30p.m., KROQ tweeted that “due to illness, the Chili Peppers were forced to cancel their set.”

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Other bands on the bill included Panic! at the DiscoEmpire of the SunGarbageLumineersFitz and the Tantrums and Miike SnowBlink-182 also performed a surprise set.

Billboard has reached out to reps for the Chili Peppers for comment.

Developing…