Recently leaked audio recordings of controversial conversations between senior Egyptian officials have “no indications” of being fabricated, according to an analysis that has been provided to British police, the New York Times has reported.

For several months, a number of recorded conversations have been leaked to the media, including one involving Egypt’s President Abdel Fattah el-Sisi.

In the taped conversation, Sisi makes offensive remarks about some Gulf countries, suggesting Saudi Arabia, the United Arab Emirates and Kuwait have more money than they need, and that Egypt should have a share.

The Times reports that if the recordings are accurate, billions of dollars may have been siphoned off into special military accounts outside the control of the civilian government.

The three countries provided key financial aid to Egypt after Mohamed Morsi was ousted from power in July 2013.

A separate recording, obtained by Al Jazeera in February, appears to reveal Egypt’s interior minister Mohamed Ibrahim discussing how the government can crack down on protesters across the country, using everything from water cannon to live rounds.

After the first recordings emerged last year, Egypt dismissed them as fabricated.

On Tuesday, however, the Times reported that an analysis of the recordings – commissioned by lawyers for Morsi’s Muslim Brotherhood – found there were “no indications that the recordings were fabricated by splicing together disparate statements out of context”.

According to the Times, audio forensics firm JP French Associates found “moderately strong evidence to authenticate Mr Sisi’s voice on two of the recordings and the voice of a top general, Mamdouh Shaheen, on another”.

The analysis will reportedly form part of the lawyers’ evidence in a British criminal case against the leaders of the Egyptian takeover in 2013. Al Jazeera