The Office of Fair Trading has launched an investigation into suspected cartel activity involving commercial vehicle manufacturers in the country.
The OFT has visited the UK offices of Mercedes-Benz as part of the wide-ranging investigation into the allegations.
A spokesman said: "Investigations are being carried out under both the Enterprise Act 2002 and the Competition Act 1998. The investigations are at an early stage.
"The OFT will not be in a position to conclude whether it considers the law has been infringed until it has completed its investigations and assessed the available evidence."
In relation to the case, one individual has been arrested and released on bail, the OFT added.
The OFT has requested information from Scania of Sweden and Germany's MAN as part of the broad-ranging investigation into the pricing of trucks, the Financial Times reported today.
The newspaper said the action represents a significant move by the OFT, as it is the watchdog's only criminal cartel case - apart from a failed attempt to prosecute British Airways - to feature businesses that are household names.
Companies involved in price-fixing can be fined up to 10% of their annual turnover.
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