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An airport spokesperson said "one person has been taken to hospital for further assessment" and airport staff were managing the vehicles leaving the site.

Most invasion scientists aim "to prevent introductions of harmful invasive species in the first place through public education, better screening tools and risk assessments," she said.

"But we are not getting into an assessment of the rights and wrongs of it," said another source.

"Similarly, the assessment that Iran could develop a crude nuclear weapon within a few months is not new."

The state prosecutor's initial assessment was that the boy, called Quentin, came from a normal functioning family, and had no criminal or mental health record.