Key suspects in the Bomb Attack at Wellington's Trades Hall Hall will provide DNA samples 35 years after the unresolved crime.
The detainees have resumed the 1984 bombing, which killed Ernie Abbott, the caretaker of the Vivian St.
Evidence pointing to key suspects and details of bomb components were among the new information discovered in one episode A cool case, which was broadcast on Sunday night.
Earlier Sergeant Warwick McKee said Things the key suspect was among the many people who agreed to give DNA samples, which could be compared with the analysis of bomb material that is still being held as evidence.
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"We've been in the past, he's pretty old now, and he has refused it earlier … We're open," McKee said.
The detective decided to visit the case again 18 months ago, after police received a "matter of importance" similar to the key piece of the bomb.
The bomb was built with an old kiln, a nine-volt battery, an unknown explosive and accelerator of one or two bottles – probably gasoline – one of which was a Teal bottle. On the case were pages 9, 10, 19 and 20 on June 18, 1977 Evening Post.
The live switch, activated after the counter counted for 60 minutes, connected the circuit and exploded the bomb when Abbott picked up the suitcase.
Such a bomb demanded considerable expertise.
Among the cases found in the search of a suburban house of key suspect were security fuses, detonators, battery-powered torch, four bottles of teal juice and a copy of the same edition on June 18, 1977 Evening Post – no relevant pages.
The suspect experienced gold on the South Island, and when he was interviewed in 1984, he described himself as an explosive expert. He also had a violent past, a history of surplus, and he thought it was an anti-union.
The suspect motive for bombing, which came in the period of particularly heavy industrial relations, was hatred towards trade unions.
"He set that profile and was exposed to explosives and bomb components," McKee said.
But it was not "a case closed" because the evidence was indirect. We hope that publishing this information might trigger the memory of someone who knew the bombers and, perhaps with the help of DNA analysis, secured a conviction.
"This is pretty solvable, someone knows who the perpetrator is."
Police have been talking to less than 10 suspects in recent months.
Peter Dijkstra, a former leading suspect who was switched off in 2001 and who did not participate in the show, also talked with him.
Dijkstra did not arrive on Sunday. At the entrance door was a message dated: "25-year-long persecution of the NZ police."