The incident took place in Parsloes Park 10 days ago on March 14, prompting the Metropolitan Police to launch an “urgent” investigation.
It is believed to have been one of the latest incidents following a string of reports received by the force concerning the park.
Officers were alerted to the gun-point robbery at 7pm on March 14.
In the park, the victims had allegedly been threatened with a gun but were thankfully not injured.
At the time of the initial report, there were no arrests made.
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A Met Police spokesperson has confirmed today (March 24) that this remains the case, and enquiries are ongoing.
In light of multiple reports of robberies inside the park, police foot patrols have been increased.
Anyone with information or who witnesses an incident should contact police on 101, quoting reference 6489/14Mar.