PANAMA CITY, April 3 (Reuters) - The head of a Panama-based law firm at the center of a massive leak of offshore financial data on Sunday denied any wrongdoing, and said his firm has fallen victim to "an international campaign against privacy."

German newspaper Suddeutsche Zeitung said it received a cache of 11.5 million leaked documents from the law firm's database, and shared them with more than 100 other international news outlets as well as the International Consortium of Investigative Journalists (ICIJ).