SINGAPORE - The lawyers of blogger Han Hui Hui have sent a letter to the National Parks Board (NParks) asking the government agency to lift its ban on her protest, which was scheduled to take place this Saturday.

NParks had said on Tuesday it would cancel its permits for Ms Han to speak and demonstrate at Speakers Corner in Hong Lim Park on Oct 25.

It added that the police had advised NParks to do so as Ms Han was among a number of people being investigated for a Sep 27 protest at Hong Lim Park, which had encroached on a nearby charity carnival and scared special needs children performing on stage.

But Ms Han's lawyer M Ravi said in a letter on Thursday that NParks' cancellation of the permits amounts to "a breach of (Ms Han's) rights of freedom of speech and assembly".

"The act of assisting the police does not constitute nor can it be construed as an implication, assertion or proof of guilt of any offence, nor does it constitute evidence of a breach of any law or of the terms and conditions of approval" for the Sep 27 protest, Mr Ravi added.

He also objected to NParks' decision to deny approvals to Ms Han and other individuals "under investigation for the Sep 27 event, until their cases are concluded".

"Depending how long the police investigations take, the restriction may last indefinitely," Mr Ravi said. "It is an indeterminate, wholly disproportionate and oppressive ban."

Ms Han is requesting that the ban on her protest be lifted before 4pm on Friday, failing which she reserves the right to take legal action.