• View of a sign outside the building where Panama-based Mossack Fonseca law firm offices are in Panama City, on April 4, 2016. A massive leak -coming from Mossack Fonseca- of 11.5 million tax documents on Sunday exposed the secret offshore dealings of aides to Russian president Vladimir Putin, world leaders and celebrities including Barcelona forward Lionel Messi. An investigation into the documents by more than 100 media groups, described as one of the largest such probes in history, revealed the hidden offshore dealings in the assets of around 140 political figures — including 12 current or former heads of states. AFP PHOTO/ Rodrigo ARANGUA / AFP / RODRIGO ARANGUA