It's not clear yet if the Mossack Fonseca employee arrested is the "John Doe" responsible for the largest leak of confidential files in history.
Mossack Fonseca said in a statement that the closures in Jersey, Isle of Man, and Gibraltar were part of a company strategy to "consolidate our service office network."
We talked to investigative journalist Nicky Hager who dug through the Panama Papers to discover how Mossack Fonseca operated in NZ.
Anyone can now trawl through the names of more than 200,000 offshore companies, all of which were incorporated in far-flung tax havens.
"John Doe" compared himself to Edward Snowden and called out Wikileaks for ignoring his documents.
It's illegal to help someone evade taxes or conceal their assets from a judge in the event of a divorce — but the Panama Papers show that unscrupulous lawyers will still do so.
The law firm has come under intense scrutiny since the Panama Papers leak. Founding partner Ramon Fonseca says it has broken no laws, destroyed no documents, and all its operations are legal.
The controversial law firm at the heart of the Panama Papers leak had computers and documents seized during a raid on its offices in El Salvador's capital.
The massive leak of documents from the Panama-based law firm Mossack Fonseca has sparked an outpouring of nationalistic hubris.
We asked tax experts whether the outrage generated by the revelation British Prime Minister David Cameron held shares in an offshore fund co-run by his father was justified.
In his fifth public statement in the four days since the Panama Papers story broke, British PM David Cameron has finally acknowledged that he once had shares in his late father's offshore trust.