Whistleblower website Sarawak Report editor Clare Rewcastle-Brown has denied the accusation of stalking and harassing Prime Minister Najib Abdul Razak's wife Rosmah Mansor in London.

"Nothing to do with me. (Communications and Multimedia Minister) Salleh (Said Keruak) can see on the Internet what I look like - or do all foreign women look the same to Salleh?" she asked in an email to Malaysiakini.

Rewcastle-Brown was responding to Salleh, who last night accused Sarawak Report of shouting "slanderous allegations" at the prime minister's wife.