A 69-year-old woman reported she was raped in a Brent park.
Police were recently made aware on August 2 of the rape at Neasden Recreation Ground that took place on July 31 this year.
The woman is believed to have spoken to three women, who were at the outdoor gym at the time, shortly after the incident.
She also had spoken to a male jogger who was running at the park at the time.
According to the Metropolitan Police, the rape is alleged to have happened at around 6.30pm, and the force would like to speak to the people the woman spoke to.
The jogger is described as black, in his 30s, and the women were believed to be nearly 19-years-old.
Two of the women were wearing hijabs, and the other woman was described as short, wearing blue jeans and a black t-shirt.
Police believe that these people may be key witnesses.
A man was arrested on August 7 and charged with rape and possession of an offensive weapon.
Detective Inspector Richard Lewsley said: "We would really like to speak to these four people as they spoke to the woman and they may have some key information to help this investigation.
"I would urge them, or anyone who was in Neasden Recreation Ground at around 6.30pm on 31 July, to come forward and contact police."
If you were in the area at the time of the alleged rape, contact police on 101 referencing CAD 2309/05Aug/21.
Alternatively, email NW-PublicProtectionRASSO@met.police.uk with your details including a telephone number where possible.
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