Police were called to the address overnight. Two people are now in custody, and police say they are not seeking anyone else in connection with the incident.
Police have moved to reassure the public that there is no risk to their safety.
Detective Inspector Nicola Reeves is asking anyone who may have seen anything, or who may have CCTV of the area, to contact police on 105. Information can also be provided anonymously via Crime Stoppers.
The two injured people are reported to be in a serious condition.