A new leak of documents from Mossack Fonseca, the firm at the centre of the Panama Papers scandal, shows it could not identify the owners of up to three quarters of companies it administered.

Two months after discovering the data hijack, Mossack Fonseca was unable to identify the beneficial owners of more than 70 percent of 28,500 active companies in the British Virgin Islands as well as 75 percent of companies in Panama, according to the documents. 

The new leak contains 1.2 million documents dating from before the Panama Papers went public in April 2016 to December 2017. The data was obtained by Germa...