A Brazilian attorney who was working at Gibson, Dunn & Crutcher has been arrested and charged with insider trading, accused of accessing internal law firm files to trade ahead of a major merger and acquisition.

Federal prosecutors in D.C. said Romero Cabral Da Costa Neto, 33, of Rio de Janeiro, Brazil, was arrested on Tuesday in Washington, D.C., by agents with the FBI’s Washington Field Office. Costa is separately facing an SEC lawsuit over similar allegations.