A man and woman, in their late 60s have been found dead in a tower block in west London.
Police say they were called by officers in Surrey after a person raised concern for them.
Detectives made the discover just before 7 am May 22.
A man, in his late 40s, has been arrested in by Surrey police on suspicion of murder.
Detectives from the Met will bringing him to a London custody so he can be questioned in due course.
A crime scene remains in place at Adair Tower.
A post-mortem examination will be held in due course. Formal identification awaits.
Police are in the process of contacting the deceased’s next of kin.
This investigation is now being led by the Homicide and Major Crime Command under DCI Rob Pack.
He said: “This is an awful case where an elderly couple have been found dead in their home.”
“My team are busy carrying out a number of enquiries included local CCTV footage review, house to house enquiries and forensic work but need to hear from those who have information.”
“Do you live nearby? Did you see or hear anything suspicious? We need you to get in touch and speak with investigators as soon as you can.”
Any witnesses or anyone with information is asked to call police on 101 quoting CRIS reference 5609638/19.
You can also call Crimestoppers anonymously on 0800 555 111 or tweet information to police via @MetCC.