The company, which is valued at about $6.9 billion, said it cannot estimate the financial impact resulting from this.
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TRW said on June 7 the European antitrust authorities had visited some of its locations in Germany to obtain information in connection with an anti-competitive investigation in the European Union.
A related request was made in the United States.
The Livonia, Michigan-based TRW said it is fully co-operating with the competition authorities.
Shares of TRW, which closed at $55.85 on Friday on the New York Stock Exchange, were down 2 percent in premarket trade on Monday.
(Reporting by Fareha Khan in Bangalore; Editing by Don Sebastian)