The incident has resulted in St Mary’s Way being closed and buildings being evacuated as emergency services respond to the incident.
Here are photos of emergency services at the scene as the event unfolds.

13. John Street
Traffic builds on John Street as police close surrounding roads Photo: National World

14. Keel Square
Part of Keel Square cordoned off as police respond to a 'malicious communication' Photo: National World

15. Cordon in place
A police cordon in place, Keel Square, Sunderland Photo: National World

16. St Mary's Way
St Mary's Way closed as police respond to a 'malicious communication' Photo: National World
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