Officers soon determined, however, that the geese who'd flown overhead were to blame.
Almost 20 parkgoers at Disneyland on Friday night got a nasty surprise when a flock of geese defecated on them, prompting a response from a hazardous materials team.
Emergency services rushed to Disneyland after reports guests had been struck by poo.
Visitors enter the Disneyland theme park in Anaheim.
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"It was clearly goose poop", Sgt Daron Wyatt of Anaheim police said. The tweet also mentioned that "guests were hit by fecal matter" from "geese that flew over", adding that there were "No injuries".