Scotland Yard signed a three-year deal with Oxygen Forensics in December 2023. The software is used to extract and analyse data from phones and other devices seized during criminal investigations.
A Met Police spokesperson said: "We have paused our use of the tool while we carry out a full review. At this time, we believe any impact to ongoing investigations will be extremely limited. The Met does not share any data obtained from investigations with Oxygen Forensics Inc."
The force said Oxygen's software runs on a closed IT system not connected to the internet.
The pause follows allegations by the US Department of Justice that Oxygen, based in Alexandria, Virginia, presented itself to US government customers as an independent American company despite being owned by five Russian nationals through a Cyprus-based holding company. Prosecutors have accused Oxygen CEO Lee Reiber and Russian national Oleg Sergeyevich Davydov of concealing the company's true ownership and the location of its software development.
US authorities allege that the same five Russians also owned Moscow-based MKO Systems, previously known as Oxygen Software, where developers actually wrote Oxygen's code. MKO reportedly sold the technology in Russia under different names to customers including the Federal Security Service (FSB), the Russian Investigative Committee and the Ministry of Internal Affairs.
The DOJ has not alleged that Oxygen's software contained malicious code or that customer data was accessed without authorisation.
Davydov, 52, was arrested at London's Heathrow Airport last month and appeared at Westminster Magistrates' Court on Tuesday. The court declined bail, with a clerk stating that it "hadn't had enough time to gather important information." The US is seeking his extradition.
The fallout extends beyond the Met. The National Police Chiefs' Council said other UK forces also use Oxygen products and have been encouraged to carry out their own local assessments. Romanian authorities have begun terminating use of Oxygen products, and Latvia's State Police has suspended the software pending an assessment.