A man and a woman were found stabbed to death at a property in southwestern London this morning.
A neighbor heard screams after the discovery of the bodies inside.
Police were called to a house in Whitton near Twickenham Stadium at 9:51 am today.
A man in his sixties and a woman in his sixties were fatally stabbed.
A 31-year-old man was arrested in Slough this afternoon on suspicion of having been murdered. He is currently being transferred to a London police station.
Sanaulhaq Khan-Tokhi, 49, who lives near the home where the murder was committed, said he heard a man and a woman scream hysterically outside the house after discovering the bodies at the house. ; inside.
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After comforting the couple on the street, Mr. Khan-Tokhi said that he had gone inside the house and found the bodies of a man and a man. 39, a woman in a bedroom "covered with blood".
A dead woman was lying in bed, her throat slit and the body of a bloody man lay on the ground, he said.
Another neighbor, who did not want to be named, said she heard a woman shout "murder, murder" outside the house at about the same time.
Chief Superintendent Sally Benatar, who heads the South West Met Command, said, "My thoughts are with the family and friends of the two victims.
"I want to reassure members of the community that it was an isolated incident.
"After arresting a man this afternoon, we are not looking for anyone else in connection with the two dead.
"I would like to express my thanks to colleagues from the emergency services, including the Thames Valley Police, who supported our response to this incident."
A crime scene remains in place. The investigations continue to establish all the circumstances.
The officers believe they know the identities of the two victims and that their family is supported by family liaison officers, Scotland Yard said in a statement.
The detectives of the Specialist Crime Command are investigating.