The woman said Myna Pl in Weymouth had been inundated with police since the mysterious incident yesterday.
A month ago there had been another incident at the address and the woman said neither she or her husband had since the residents of the property since then.
She said two police cars and at least two officers armed with guns remain at the property since she first saw police there yesterday evening.
"When I arrived home around 6.30 yesterday there were probably about 10 police officers that were in boiler suits," she said.
"[Currently] there is armed police guarding the entrance of the house and they've got a mobile police unit parked outside and there is a white tent outside."
The Herald has sought comment from police.