Four men were attacked in Brentford, Hampton, Hounslow and Bromley between New Year's Eve and 9 January.
A man has been arrested as part of an investigation into a series of attacks in which the dating app Grindr was used by thieves to meet potential victims.
Two suspects were identified by the Met last month - a large black man and a slimmer white man who both spoke Spanish. Police believed both fled the country. Det Supt Dan O'Sullivan said: "We believe other victims may have been targeted between the new year period and January 9, however for personal reasons may not have wanted to report it.
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