GENEVA: Swiss prosecutors announced Friday that they had refused to reopen a probe into alleged corruption in the 1990s by current Pakistani President Asif Ali Zardari and his late wife Benazir Bhutto.

Prosecutors in Geneva said that the decision was taken on February 4 this year, and that they had only opted to make it public as a result of street protests in Pakistan.

They declined to comment in detail, but the Swiss news portal 20minutes.ch published photographs of anti-Zardari protestors burning Switzerland's flag at a rally in Pakistan.

Zardari and Bhutto were alleged to have siphoned $12 million in state cash in the 1990s, when he was a government minister and she was premier.

Geneva prosecutors underlined Friday that no new evidence had emerged since the case was dropped in 2008, meaning they could not reopen the investigation.

In addition, the fact that the alleged offences took place more than 15 years ago meant that the statute of limitations had expired, they said.

They also complained about mixed messages from Pakistan.

Just a month after filing the renewed request, Pakistan sent them a letter stating that the call for a revived probe was linked to domestic politics and that there was no need to heed it.

That amounted to abuse of the legal system, prosecutors said.