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Intruder alert was an alert status in facilities which were sounded when an intruder was detected.
An "Intruder Alert Level 5" was declared in a Department virtual reality detention facility when a Jixen warrior penetrated the prison. (TV: Regeneration [+]Loading...["Regeneration (TV story)"])
The Thirteenth Doctor mistook the doorbell in Graham and Grace's house for an intruder alert. (TV: Resolution [+]Loading...["Resolution (TV story)"])