Greater Manchester Police has referred itself to the police watchdog after three people were found dead at a property in Failsworth.
Officers were called to Oldham Road by paramedics responding to a report of concern for welfare at 3.30pm on Monday.
Three people were pronounced dead at the scene.
But the force has voluntarily referred itself to the Independent Office for Police Conduct as officers had attended the same address on December 23.
An IOPC spokesperson said: “We have been notified by GMP of the incident in Failsworth and we will be assessing a formal referral from the force."
The referral is due to the previous contact the force had with people at the address.
The IOPC must now decide whether to launch a full investigation themselves or let the force do their own internal inquiry.
Three people, understood to be a woman, and two men, were found dead at the scene.
Their deaths are being treated as unexplained and enquires are ongoing.
Police, fire and ambulance vehicles were pictured at the scene on Monday evening.
A front garden was also taped off.
Crime Scene Investigators were also pictured.
A police spokesperson said: "At 3.30pm on Monday 28 December 2020, police were called by paramedics responding to a report of concern for welfare on Oldham Road, Failsworth.
"Officers attended.
"Three people were sadly pronounced dead at the scene.
"Their deaths are being treated as unexplained. Enquires are ongoing.
"Anyone with information should contact police quoting 1595 28/12/20 or the independent charity - Crimestoppers, anonymously, on 0800 555 111."
