Israeli police raided the trade and industry ministry on Tuesday and seized documents related to the latest corruption probe against Prime Minister Ehud Olmert.

"As part of the ongoing investigation of the prime minister, police officers of the national fraud unit this afternoon searched the offices of the trade and industry ministry and confiscated documents," police spokesman Mickey Rosenfeld told AFP.

Olmert, who headed the ministry between 2003 and 2006, is suspected of having received funds illegally from millionaire US businessman and fundraiser Morris Talansky in the 13 years before he became premier in 2006.

He has denied any wrongdoing and insists he will only step down if indicted.

On Monday, police raided Jerusalem city hall and confiscated documents related to the probe, one of four pending corruption probes to embroil the embattled premier. Olmert was Jerusalem mayor from 1993 to 2003.

According to the mass-selling Yediot Aharonot daily, police investigators suspect that Olmert helped Talansky associates win tenders and purchase land in Jerusalem while he was mayor and minister.

Other media reports said that Olmert also ordered speed bumps to be placed in the Jerusalem street where Talansky's son lived.

Olmert, who has been dogged by scandals since he took office in 2006, last week insisted he had never taken a bribe and said he would quit if indicted.

But he acknowledged that he had received what he said were legitimate financial contributions for various election campaigns from Talansky.

Talansky said on Sunday that he gave financial contributions to Olmert but insisted he had believed they were intended for legitimate purposes.

"I never thought in any way that the money I gave was illegal or wrong," the 75-year-old Jewish financier told Israel's private Channel 10 television in his first public comments on the scandal.

An opinion poll on Monday showed a majority of Israelis think Olmert should resign over the latest corruption investigation against him, the fifth such probe since he assumed office, though one case has been dismissed.

Fifty-nine percent of Israelis want Olmert to step down and 60 percent do not believe his denial of any wrongdoing, according to the survey published by Yediot Aharonot.