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“The notion that people panic and run screaming for the exits is a Hollywood fiction,” said Prof Stephen Reicher, an expert in group behaviour at the University of St Andrews.

“Characteristically, people stay and help each other,” he said. “We found this during the 7/7 attacks on the underground and the 1999 attack on the Admiral Duncan pub in London, where people looked after each other even though they feared other bombs.

“In our own research on the Leytonstone tube attack in 2015, there was an amazing level of spontaneous coordination by bystanders: some directed others away from danger. Some distracted the attacker. Some confronted the attacker. Each was able to act because of the others. Heroism was a feature of the group, not just the individual,” he added.