Roads were sealed off because of a major incident.
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Related: incident
Prev: The headteacher, Maureen Cobbett, sent a letter to parents which said, "I'm writing to let you know that there has been an incident involving a pupil."
Next: A railway worker named Phineas Gage survived an incident during which a metal rod skewered his skull, taking a considerable amount of his neocortex with it.