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An inquest has found there was poor training and inadequate risk assessments at a factory in Norwich where two men died in an explosion.
After nearly two weeks of evidence, a jury has recorded a narative conclusion into the deaths of Barry Joy and Daniel Timbers at Harford Attachments in July 2015.
The families of the two men are now calling for more to be done to improve safety in the workplace.
Click below to watch a report by ITV News Anglia reporter Graham Stothard
Detectives investigating the deaths of two men at an industrial unit in Norwich have completed their on-site enquiries.
Officers have been working with colleagues from the Health and Safety Executive since the incident at Harford Attachments on Monday 13 July.
Daniel Timbers, 29, and Barry Joy, 56, both died as a result of the effects of fire and inhalation of fumes of combustion.
The men were killed while working in a confined unit and evidence gathered so far suggests a flash over explosion happened as a result of a build-up of toxic fumes with some sort of ignition causing a fire ball.
Police investigating an industrial accident at a factory on the outskirts of Norwich have described the blast which killed two men as a 'fireball'.
The incident at Harford Attachments in Hellesdon on Monday killed Daniel Timbers and Barry Joy instantly according to a post-mortem examination.
They died as a result of the effects of fire and "inhalation of fumes of combustion."
Investigations are continuing into the cause of the explosion in Norwich yesterday where two men died.
Flowers have been placed at the scene on the Vulcan Road Industrial Estate in Hellesdon.
The men, one of whom was in his 50s and the other in his 20s were employed by Harford Attachments.
It's understood they were working in the paint spray area at the time of the explosion.
The road around the unit was closed all day yesterday and re-opened this morning.
Read more: 'Explosion' on Norwich industrial estate
An explosion has hit an industrial estate in Norwich killing two factory workers.
The scene is still so dangerous that emergency services have so far been unable to recover the two men, one in his 50s and the other in his 20s.
It's thought the blast started a fire in the paint workshop at Harford Attachments in the Hellesdon area close to Norwich airport.
Latest ITV News reports
The managing director of a Norwich factory where two men were killed in an explosion, has been giving evidence at their inquests.
Daniel Timbers and Barry Joyboth died as a result of the effects of fire and inhalation of fumes of combustion in July 2015.