Sussex Police said that they received a call at 4.30pm yesterday afternoon and sent officers to a property in London Road, Bexhill.
Armed police were then called to the scene. The incident involved three males, according to police, and carried on throughout the night.
It is still ongoing, and officers remain at the scene but armed police are no longer present.
On Facebook, residents said that Buxton Drive, which is a short distance from London Road, had been cordoned off yesterday and police officers were present.
A police spokesman ruled out murder or a terror attack as the cause of the incident, and said a further statement will be issued shortly.
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