You are the incident commander at a mass casualty incident. Two passenger trains have collided inside a tunnel that is one mile in length. Initial casualty reports are in the hundreds. What type of incident is this?

This is a closed incident.

Explanation:

A closed incident is surrounded by physical structures that limit it - in this case, the trains are inside a tunnel. That makes it difficult for rescue workers to access the site of the incident, reducing their ability to respond to the emergency. Consequently, access, transportation and treatment of the victims are also done with difficulty.

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