Spears, machetes, and SAWS: The shocking weapons found inside Bali's Kerobokan prison after deadly riots broke out where several Australians are being held 

Weapons including saws, machetes and spears are among those used in the deadly riots that broke out being clashing gangs at Bali's Kerobokan prison.

Four people reportedly died at the riot on Thursday afternoon, including two prison inmates – though all Australian inmates are said to be safe and unharmed.

The violence stemmed from rivalry between gangs Laskar Bali and Baladika Bali.

Three others are injured, ABC reported.

Local police have questioned how six garbage bags of such dangerous weapons – also including knives, a bulletproof vest, what looks like a crude crossbow, methamphetamine and a laptop computer – ended up in the prison, according to Daily Telegraph.

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Weapons including saws, machetes and spears are among those used in the deadly riots that broke out being clashing gangs at Bali's Kerobokan prison

Local police have questioned how six garbage bags of such dangerous weapons – also including knives, a bulletproof vest, what looks like a crude crossbow, methamphetamine and a laptop computer – ended up in the prison

More than 100 prisoners were moved to prisons across Bali on Thursday night after the violence broke out between 3pm and 4pm that afternoon.

18 men are being questioned over the riot.

Indonesian authorities have said they will audit Kerobokan in response to the fatal riot.

A water cannon, ambulance and bomb squad vehicle had been brought on site on Thursday, while prison guards were evacuated from the prison, a 30-minute drive north of Kuta.

On Thursday night Bambang Yugisworo, head of detectives at Bali Provincial Police, told reporters they was no damage to the prison itself.

He confirmed that inmates had died but was unsure of numbers.

Baladika's I Putu Sumariana, known as Robot, who was serving time for murder, died with a wound to his stomach.

Dore, another Baladika member, was stabbed and died in hospital, Daily Telegraph reported.

Another man reportedly died around 1.5 kilometres from the prison when the fight continued outside the prison.

It is not certain how the fourth man died. 

A water cannon, ambulance and bomb squad vehicle had been brought on site on Thursday, while prison guards were evacuated from the prison, a 30-minute drive north of Kuta

Indonesian authorities have said they will audit Kerobokan in response to the fatal riot

Four people are reportedly dead and three are injured after riots broke out in Bali's Kerobokan prison, where Australians are among the inmates

Among the inmates, three members of Australia's Bali Nine, Si Yi Chen, Michael Czugaj and Matthew Norman, are serving life imprisonment at Kerobokan for the 2005 botched drug trafficking.

Perth man Joshua Terelinck, 33, is serving at the prison for dangerous driving after local man Putu Agnus Andryatna, 22, was killed in a motorcycle crash in July.

He is serving two months and 15-days jail and is due for release next week.

Terelinck had paid nearly $6,000 in compensation to the victim's family, who didn't want to press charges and gave evidence to the court in his defence.

Mr Anryatna was reportedly conscious following the crash but died in hospital eight days later to his injuries.

Terelinck returned to Bali upon hearing of his death because it was the right thing to do, he said.

Nicholas Langan, 25, has been jailed at Kerobokan for a year after he was arrested in January for drug consumption.

He was arrested at Canggu beach after midnight on January 27 for sharing a marijuana joint.

He gave a long apology during the trial and said he had been trying to overcome his marijuana addiction.

While it's the first time Kerobokan has been in Australian headlines since Bali Nine ringleaders Myuran Sukumaran and Andrew Chan were removed for their April executions, it has regularly made the news locally.

Former Wollongong bartender, Martin Stephens (left) and Sydney catering worker Matthew Norman (right), pictured at Kerobokan Jail, Bali, in 2007, two years after they were duped by Chan who had promised them quick riches by acting as heroin mules in Bali. Norman is an inmate at Kerobokan

The Bali Nine trials began in October 2005 at Denpasar district court: Top row (from L-R) Myuran Sukumaran, Andrew Chan and Martin Eric Stephens, 2nd row (from L-R) Chen Si Yi, Tach Duc Thanh Nguyen and Matthew Norman, and 3rd row (from L-R) Scott Rush, Michael Czugaj and Renae Lawrence. Chen, Norman and Czugaj are inmates at the prison where riots broke out on Thursday

Perth surfer Joshua Terelinck (pictured left and right), 33, is serving at the prison for dangerous driving

Local man Putu Agnus Andryatna, 22, was killed in a motorcycle crash in July and Terelinck is serving two months and 15-days jail and is due for release next week (pictured being transported from a holding cell to face trial in November)

Terelinck had paid nearly $6,000 in compensation to the victim's family, who didn't want to press charges and gave evidence to the court in his defence (pictured facing trial in November)

Nicholas Langan, 25, has been jailed at Kerobokan for a year after he was arrested in January for drug consumption

In May, prison guards released the wrong prisoner because he had a similar name to a man who was set for release.

In the same month, a man was stabbed to death in a fight, and authorities are growing increasingly frustrated that they cannot bring the prison's drug problem under control.

Indonesia's chief ombudsman visited the prison earlier this year, concerned about the high incidence of drug use.

Ombudsman spokesman in Bali, Umar Ibnu Alkhatab, said a full audit of the jail was requested in September.

Law and Human Rights Minister Yasonna Laoly on Friday agreed an audit was needed.

He sympathised with inmates in the overcrowded jail, saying they needed more rehabilitation programs to keep busy.

'They're crammed in one place,' he told reporters at an event on gardening therapy for prisoners in Jakarta.

'These two groups are frequently seeing each other, brushing against each other.' 

A water canon, ambulance and bomb squad vehicle were on site and prison guards had been evacuated from the jail, a 30-minute drive north of Kuta (stock image)

On Thursday night Bambang Yugisworo, head of detectives at Bali Provincial Police, told reporters they was no damage to the prison itself (stock image)

Corrections Director-General I Wayan Kusmiantha Dusak also promoted a therapeutic approach.

'People who steal, they don't love the people they stole from. They use drugs, because they don't love themselves,' he said.

'How to grow love within themselves? This must be taught.'

Rehabilitation programs were introduced to Kerobokan prison by Sukumaran and Chan, who convinced sceptical authorities of their benefits.

Sukumaran's own rehabilitation was largely achieved through his pursuit of painting, an experience he then shared with his fellow prisoners through arts, computer and other classes.

Thursday's feud continued on a street in Denpasar, where another two people were killed.

The gangs met at Bali police headquarters on Friday to sign a peace agreement.

Bali Provincial Police Chief Sugeng Priyanto said the men apologised to the people of Bali.

'I'm committed to maintaining the security and safety of all tourists whether they be foreign or domestic,' he said.