A Metropolitan Police spokesman confirmed an allegation of rape had been made against a man in his seventies over an incident in 1967. The spokesman said:
In late 2012, a woman alleged to the Metropolitan Police Service that she was raped by a man in 1967 at an address in London.
The woman was over the age of 18 at the time of the incident.
The allegation is being investigated by officers from the Sexual Offences, Exploitation and Child Abuse Command.
In June 2014, a man aged in his seventies was interviewed under caution by appointment at a central London location in connection with the allegation.
He was not arrested. Enquiries continue.
More top news
More than 1.85 million people have called for the US president's visit to be watered down to avoid causing "embarrassment" to the Queen.
Jim Mattis arrived in Baghdad on the day after US-backed Iraqi forces launched an operation to reclaim Mosul from IS.
The scale of the blood poisoning disease sepsis is "far worse" than previously thought thanks to a "crippling" lack of data, a study says.