Mastermind behind 2002 Bali bombs which killed hundreds to walk free

The man who built the explosives for the Bali bombing terror attack is being freed from jail.

Three Kiwis were among the 202 people killed in the blast. The Indonesian government claims the bomber is a changed man and could walk free.

On October 12, 2002,  an inconceivable act of violence on two Bali clubs filled the night with terror. 

Soon the mastermind behind the bombs, Umar Patek, will walk free from jail.

Australian Prime Minister Anthony Albanese said letting the Bali bomber walk free was the wrong thing to do.

"He was responsible for death and destruction on a major scale and this decision by the Indonesian government will add to the trauma that families are feeling at this time."

With a US$1m (NZ$1.6m) bounty on his head, Patek was on the run for almost a decade.

He was captured in Pakistan in 2011 and extradited to Indonesia where he has served just half of his 20-year sentence.

The sentence was reduced because he claims to have been deradicalised. 

Survivor Erick de Haart was outraged at the decision.

"Ten years is enough for 200 people. Is that enough? I don't care if he's been deradicalised or not," de Haart said.

De Haart survived the blast but six of his friends didn't make it.

"This guy is responsible for the death of over 200 people and he gets out because he's been a good boy in jail - please!"

Each year Indonesia marks Independence Day by reducing thousands of prison sentences.

While three Bali bombers were executed in 2008, most have received sentence reductions. Patek's was reduced 11 times. 

His release comes just weeks away from the 20th anniversary of the attack. A second chance his 202 victims never had.