Police have been negotiating with a man in possession of a sword.
Officers were called to reports of a domestic incident in Durrington.
Sussex police say they were notified at approximately 12.11pm this afternoon (Wednesday, 12).
The force arrived at the property in Rochester Close.
The man was discovered by police in the garden with the sword.
A police cordon was put in place to contain the area and ensure the safe welfare of members of the public.