A Supreme Court judge ordered an investigation into potential insider trading in Brazil’s currency markets around the announcement of US tariffs on Brazilian goods.

A sudden drop in the Brazilian real just before the announcement of steep U.S. tariffs has triggered a high-profile investigation in Brazil. Authorities are now trying to find out whether anyone used inside information to profit illegally from the currency markets ahead of the news.

The Brazilian Supreme Court is investigating whether insider information was used for improper gains in the international exchange market.