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The agency said that it launched a new investigation into fraud at London-based AOG Technics Ltd., which for several years has supplied aircraft businesses with parts for popular jet engines produced by CFM International.

The BBC could not immediately reach AOG Technics for a comment.

Earlier this year, UK, US and European regulators issued alerts to firms to check parts from AOG Technics.

Ryanair, as well as US carriers such as American Airlines, United Airlines and Delta, are some of the operators investigating engine parts that may have come from AOG Technics, according to reports by Bloomberg.

AOG Technics mostly sold to overseas companies that install airline parts but some UK airlines were also affected, the SFO said.