Kuala Lumpur, Aug 28 (IANS): Malaysia has blocked a website run by organisers of a large anti-government protest planned for the upcoming weekend, the media reported on Friday.

According to sources, Bersih.org website could not be accessed on Malaysian mobile phones and computers, BBC reported.

The Bersih 4.0 protest is due to be held across three cities in Malaysia over the weekend, including Kuala Lumpur. Thousands are expected to rally in the capital alone.

It is being organised by civil rights group Bersih, whose name means "clean" in Malay and has been calling for electoral reform.

Authorities warned on Thursday that sites which promoted and spread information about the demonstration would be blocked.

Protest organisers are calling for Prime Minister Najib Razak to step down over allegations of corruption.

Najib is accused of siphoning $700 million from a sovereign wealth fund into his personal accounts. The prime minister has denied the claims.

The anti-corruption agency effectively cleared him of wrongdoing earlier this month, saying the money was personal donations.