It turns out the frightening sound wasn't gunshots after all - but the fear was very real.
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"I heard 'boom boom boom' like that sound like a gunshot and that's when everyone whooshed. Everyone started huddling, and going down. And everyone started freaking out. And then I heard it again like 'boom boom' and that's when everyone started freaking out," said Annabelle Smart.
Police say the cause of the mortifying fear was the sound of a police barrier that fell.
The crowd feared the worst.
"Just a mob of people started running. It felt like a war zone. It was insane, and then people were just running and there were security guards telling us to duck down," said Teddy Dumont.
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No gunshots were fired.
Most of the injuries were minor.
The show continued after a brief interruption - but many people left, in no mood to return.
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