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Escaping the crush Fear of terror can trigger mass panic

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It's festival season in Switzerland and organisers of big events are on high alert in case of terror attacks. (SRF/swissinfo.ch) 

Researchers in Zurich are warning that if audiences at major events fear terror attacks, even a small bang can trigger mass panic, and organisers need to have escape plans in place in case of a stampede. 

In May this year, 22 people were killed after a bomb went off at a concert given by American singer, Ariana Grande, in Manchester, Britain.