A MAN was killed in a workplace incident at Kingston yesterday, just a month into his new job.

It was the fourth building industry death in eight months for Canberra, prompting the ACT Attorney-General Simon Corbell to consider a broader review into the construction industry's safety standards.

The victim, aged in his early 20s, was part of a team pouring concrete at the Dockside apartment development in Eastlake Parade at Kingston about 9.44am when the pouring boom from a truck broke away and fell to the ground.

The Belconnen Concrete employee was struck by the 39-metre boom, leading to the fatal injuries. ACT Ambulance attempted to resuscitate the man, but he died at the scene.

Two other workers were injured in the incident and were taken to the Canberra Hospital.

A spokeswoman from the hospital confirmed last night that a 26-year-old was in a stable condition and a 39-year-old was in a serious but stable condition.

The accident shut down work on the multimillion-dollar site, with dozens of construction workers ordered off the job while an investigation takes place.

The site is expected to open again this week.

ACT Policing said it was preparing a brief for the coroner with the assistance of Work Safe ACT.

ACT Work Safety Commissioner Mark McCabe said early indications point to equipment failure.

He said the accident appears to have been caused by the bolts holding the boom to the truck shearing away.

''The hard part is we don't know why it happened, the truck has only just been totally inspected and done three concrete pours since then,'' Mr McCabe said. ''It could pan out there's some work practice issue as well, but every indication is the bolts collapsed.''

He said the investigation could take months.

Construction, Forestry, Mining and Energy Union ACT assistant secretary Jason O'Mara said the deceased had only been employed by Belconnen Concrete for about four weeks. Mr O'Mara said Belconnen Concrete was a well-regarded local firm with a strong safety record.

''Sometimes you can tell straight away what's occurred, but this one looks like a case of equipment failure,'' he said. ''Yet the company has plant records showing the boom has been fully serviced and maintained and only three weeks ago it was fully stripped down. We need engineers to investigate to ascertain what happened.

''Early investigations show the company had the pump fully serviced and maintained and this was the third outing for a pour since that had been done.''

The site is being developed by the Doma Group and overseen by construction managers Bloc.

Bloc director Drew Mathias made a statement on behalf of the two companies.

''Doma and Bloc are providing full support and co-operation to authorities in this matter,'' Mr Mathias said. ''Our thoughts are with the workers and their families. Those on site will be offered support and counselling.''

Mr Corbell yesterday tasked the Justice and Community Safety Directorate with the preparation of options for government to conduct an investigation into workplace safety. The government has already led a civil construction round table - bringing together relevant ACT unions, the Master Builders Association and the Civil Contractors Federation - to put forward recommendations.

That report is due back in weeks.