A firearm was recovered at the scene where a retired police inspector and his female partner were found dead on Saturday morning in Wiltshire, police have said.
Detective Chief Inspector Ian Saunders from Wiltshire police has said: "The investigation continues to try and establish what led to this tragic incident.
"We have recovered a weapon from the scene. My working assumption is that weapons were discharged and the victims had sustained some form of gunshot wounds."
Post-mortem examinations will be carried out today.
Officers are not looking for anybody else in connection with the shootings, which happened on Moonrakers estate in Devizes.
More top news
Public Health England wants smoking to be banned in every hospital's buildings and grounds.
From the time and place, to the nominees and host, as the statuettes are given a final polish, here's a cheat sheet to tonight's ceremony.
Figures released to Parliament show more than 12,000 military food packages were thrown away between April and December last year.