The British cops grilled Spacey, who is accused of assaulting six different men between 1996 and 2013, in the USA sometime in May, Variety reported Saturday.
It is claimed the offences were carried out between 1996 and 2013.
In May, the officers travelled to the USA to interview the 59-year-old actor under caution, the United States website Variety first reported.
The Hollywood star was voluntarily interviewed under caution in May but he was not arrested following the allegations.
Officers from the Met's Complex Case team questioned Spacey in the US, police said, without specifying exactly where the meeting took place or whether it focused on one or more of the allegations. "He was not arrested".
Allegations first surfaced against the star following the Harvey Weinstein scandal. Most of the cases center on alleged assaults in the London districts of Lambeth and Westminster; one concerns an alleged incident in Gloucester, a city in the west of England.
Spacey, 59, was artistic director at London's The Old Vic theatre between 2004 and 2015.
Although, he still faces a criminal charge in the U.S. and pleaded not guilty to indecent assault and battery in January.
After Rapp made his statement, The Old Vic hired an external firm to investigate claims related to his time at the theater, according to a statement from the theater.
Mr Rapp claimed Spacey had made sexual advances to him in 1986 when he was 14 years old and Spacey was 26.
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