LONDON -- David Cameron, his wife and their children do not benefit from offshore funds, a Downing Street spokesman said Wednesday, as pressure mounts on the prime minister to explain his family's tax affairs. 

Number 10 issued a statement after the opposition Labour Party called for an investigation into Britons implicated in documents leaked from a Panama law firm. 

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"There are no offshore funds/trusts which the prime minister, Mrs Cameron or their children will benefit from in future," a spokesman said. 

Labour leader Jeremy Corbyn had called on Cameron to publish his tax return in order to "set the record straight".

The so-called Panama Papers leak confirmed earlier reports that Cameron's late father, Ian Cameron, was a client of Panama-based law firm Mossack Fonseca.

A stockbroker and multimillionaire, Ian Cameron helped create and develop Blairmore Holdings Inc. in the tax haven in 1982 and was involved in the investment fund until his 2010 death.

He left a fortune of £2.74 million ($3.89 million) in his will, from which David Cameron received the sum of £300,000 ($426,133). His dealings were revealed four years ago in a Guardianinvestigation. 

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Downing Street's latest statement wants to end speculation that a trust fund was set up that could benefit Cameron, or his children, in the future. 

Several statements

Earlier this week, the prime minister's spokesman refused to comment on the issue, saying it was "a private matter". 

On Tuesday, Cameron was asked by Sky News if he or his family had benefited from the late father's offshore fund in the past. The prime minister replied: "I have no shares, no offshore trusts, no offshore funds, nothing like that."

But he didn't offer a reply on whether he or his family could benefit from the trust in the future. 

Downing Street then issued another statement on the same day saying: "To be clear, the prime minister, his wife and their children do not benefit from any offshore funds.

"The prime minister owns no shares.

"As has been previously reported, Mrs Cameron owns a small number of shares connected to her father's land, which she declares on her tax return."

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