A spokesman for the Verizon Wireless Amphitheater told the crowd the show would not be able continue due to fears for the band's safety.
Drummer Nathan Followill also apologized to fans on Twitter:
"So sorry St. Louis. We had to bail," he wrote, explaining that the show was stopped because a pigeon had defecated in Jared Followill's mouth. "Too unsanitary to continue," he added.
Concert goers have been a offered a full refund.
