"We cooperate fully with the authorities, but we cannot comment it further because it is an ongoing process," Paulo Stark, chief executive of Siemens' Brazilian branch, said in a statement received today.
The daily Estado de Sao Paulo today alleged that Siemens paid USD 10.3 million to two Brazilian officials as part of a vast corruption scheme in public contracts with the CPTM.
State Governor Geraldo Alckmin announced the legal action against Siemens yesterday, saying it will have to pay compensation for any losses resulting from the suspected price-fixing cartel.
Last week, Sao Paulo state prosecutors said they had launched a criminal probe after finding "strong indications" of price-rigging during bidding for delivery of trains and construction of metro and rail lines in Sao Paulo from 1999 to 2009.
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They acted based on documents from Brazil's antitrust authority CADE.
Sao Paulo officials said Siemens was targeted because it confessed to its role in the price-rigging cartel, with the CADE probe mentioning 14 suspect contracts signed by the German firm nationwide.
Prosecutors did not name the other firms being looked at but press reports identified them as Spain's CAF, Japan's Mitsui, Bombardier of Canada and France's Alstom.
Alckmin said yesterday that Sao Paulo was not an "isolated case."
"I want to recommend to my fellow governors and to the federal government, a rigorous investigation with respect to transport and energy because there was a cartel not only in Sao Paulo," he said.
The alleged price-fixing occurred under the rule of the Brazilian Social Democratic Party (PSDB) in Sao Paulo state.