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The role of environmental factors in autism is already a major focus area for government-funded research, they said, albeit in a more nuanced way.

DeCarli had been conducting a six-year examination, funded by the National Institutes of Health, of brain and vascular conditions that can be risk factors for dementia.

There are a number of other factors at play which have contributed to this record-setting day.

The threat of mass deportation combined with other factors – from military deployments at the border, to the high-profile deportations of migrants to El Salvador – may have acted as an effective deterrent.

Staff said the more serious incidents usually involveded a small number of students and were "often linked to individual circumstances, external factors, or unresolved personal conflicts".