The solidarity vigil for Bersih chairperson Maria Chin Abdullah was met with a rude shock tonight when at last 10 dead chickens were left near their gathering site.

This was the fourth night Maria's supporters have gathered near Dataran Merdeka to protest her detention under the Security Offences (Special Measures) Act 2012 (Sosma).

Priot to the vigils near Dataran Merdeka, supporters had been gathering at Jinjang detention centre since Nov 19.

A vigil participant, who only wanted to be known as Liew, said the chickens were left by the roadside and were emitting a foul rotting smell.

"There were at least 10 dead chickens... they smelt like human waste, it's disgusting," he said.

Some 500 supporters gathered there had to put up with the strong stench.

Liew put a plastic bag on his hand and proceeded to pick up the dead chickens and disposed them.

Bersih secretariat manager Mandeep Singh said the rotting dead chickens left there was an act of sabotage.

"Of course it's sabotage.

"Why do you need to throw the dead chickens here when they can be dumped in the dustbin?" he said.

Today will be the last of the continuous nightly vigils near Dataran Merdeka.

Maria's supporters would be gathering at Petaling Jaya library tomorrow for the launch of a campaign to call for Maria's release.

Maria was arrested on Nov 18, a day before the Bersih 5 rally.

She was detained under Sosma which allows for detention without trial for up to 28 days.

The investigation was over grants received by Bersih from Open Society Foundations (OSF).

Tomorrow's vigil at Petaling Jaya Library

Meanwhile, Bersih announced that the candlelight vigil venue will be changed to Petaling Jaya Library tomorrow night.

Former Bersih chairperson Ambiga Sreenevasan in her speech urged people to support Maria Chin until the government released her.

"We have cruel laws and there is no reason for the authorities to probe Maria under section 124(c) of the Penal Code which is an offence of undermining parliamentary democracy.

She also urged the people to register as voters to vote for a clean government in the next general election.

"There are more than 4.7 million citizens who have yet to register as voters.

"So make sure your friends, your family and everyone are registered as voter," urged Ambiga.

The candlelight vigil ended peacefully at around 10.30pm.