Greater Manchester Police were called to South Radford Street in Salford just after 10.30am following reports of concern for welfare at the property.
A 40-year-old woman and an eight-year-old girl have both been found dead inside a property in Salford.
Greater Manchester Police (GMP) said they were called to South Radford Street just after 10.30am following reports of concern for welfare at the property.
"Officers attended, with assistance from North West Ambulance Service and Greater Manchester Fire and Rescue Service and a 40-year-old woman and an eight-year-old girl were both sadly found dead in the property," the force said.
All known next of kin have been informed and are being supported by specialist officers.
Detective Superintendent Simon Moyles of GMP’s Salford district said: "A woman and young girl were both tragically found dead and we are working hard as a team to establish what happened here this morning.
"Whilst we are not actively looking for anyone else in relation to this investigation, I understand the news of their deaths and the large police and emergency services presence at the address will most likely cause some concern to residents and those further afield in Greater Manchester.
"I want to reassure them that we believe this to be an isolated incident with no wider threat in the community."
A Salford City Council spokesperson also said: "We are aware of the terribly sad news this morning and our thoughts and prayers go out to the family and friends of those who have tragically lost their lives.
"We’re working closely with GMP and assisting them with their ongoing investigation and our teams will be supporting both local residents and council staff who have no doubt been greatly affected by the events today."
A cordon has been put in place at the scene.