Armed police are in Etchingham Road, Langney tonight (3 May).
Officers were called just after 8pm to reports of a group of youths seen running into a block of flats, carrying baseball bats and a possible handgun.
Armed response was sent to the area, with back up from the police helicopter. Eastbourne Police have tweeted that there are any hostages being held.
Police now say they believe the situation is contained to Hampshire Court and are advising the public not to go to the area and for nearby residents to stay in their homes until the incident is over.
Sussex Police have tweeted that it the helicopter has been stood down from the area, however, they say the incident is till ongoing (10.53pm).
The situation is now resolved according to Eastbourne Police and one man is in custody.