Police have raided the headquarters of the law firm at the centre of the Panama Papers scandal.
The operation at Mossack Fonseca in Panama City on Tuesday was carried out with "no incident or interference", prosecutors said.
The offices were cordoned off while prosecutors searched inside for documents.
They were searching for documents that "would establish the possible use of the firm for illicit activities," a police statement said.
Mossack Fonseca has denied any wrongdoing since the leak, saying the only crime that has been committed was the hacking.
The leak of more than 11.5 million documents, dubbed the Panama Papers, has embarrassed several world leaders - including David Cameron - and shone a spotlight on the world of offshore companies.