THE owner of the Clutha pub has hit out at those inv­estigating the tragedy for failing to provide answers one year on from the incident in which 10 people died.

Alan Crossan claims families should by now have had more ­information on the cause of the Glasgow helicopter crash, which happened on November 29 last year.

The wreckage of the ­helicopter was taken to the headquarters of the Air Accidents Investigation Branch (AAIB) in Farnborough just days after the crash.

But the investigative body has yet to complete its report and refuses to provide any estimate of how long it is likely to take.

Until the AAIB report is published, the Crown Office cannot make a d­ecision on whether anyone should be prosecuted for the incident or whether a Fatal Accident Inquiry should take place.

Crossan said: "It is one year on and we still don't have any ­information on what happened to the helicopter.

"It's completely unfair that ­families are still in the dark about what happened.

"They can't get closure and I don't think that's right. I don't know how long these things usually take, but to me, we should have more ­information than we do now.

"It's not like the helicopter is at the bottom of the sea or anything like that.

"It's there for them to inspect and a year later we still don't have answers.

"People keep asking me about the pub, when it's going to open or what's going to happen to it, and of course that's something I'm looking at.

"But what's really important is what happened to that helicopter so the people involved can understand why this happened."

The publican added that he has not been kept informed of the progress of the investigation.

He also said he has spoken to some of the victims' families and they have complained about a lack of information.

Earlier this year, the AAIB issued an update on the investigation, reporting that both the aircraft's engines "flamed out" suddenly.

That caused the helicopter to lose power and fall "at a high rate of descent".

However, no information was given on why the engines cut out on the Eurocopter EC135 T2 despite months of exhaustive examination.

An AAIB spokeswoman confirmed that the investigation is still ongoing, adding that the body will not provide a timeline on what is going on.

She said: "We take matters like this very seriously.

"Every investigation is different and we cannot say how long it will take."

The Crown Office confirmed that a Police Scotland investigation into the tragedy has been running in parallel with the AAIB probe under the direction of the Procurator Fiscal.

Officers have been interviewing witnesses and obtaining s­pecialist reports and opinions on the incident.

They will submit a final report to the Crown following the ­publication of the AAIB's findings, which will detail the technical cause of the crash.

A Crown Office spokesman said: "Immediately following the incident, meetings were held between the Lord Advocate and Solicitor General for Scotland, and the Chief ­Inspector and Deputy Chief Inspector of Air Accidents at the AAIB to underline the need for them to carry out a ­thorough and speedy investigation in close liaison with the Crown.

"An investigation by Police ­Scotland under the direction of the Crown into the cause of the crash is under way.

"However, the AAIB inquiry is responsible for the safety part of the investigation to establish the cause of the crash and we must have this information before we can complete our investigation.

"The Crown Office and Procurator Fiscal Service is aware the ­families of those who died in the Clutha crash want the investigation to be completed as soon as possible and we can assure them that we have a specialist team of health and safety experts within the Crown Office dealing with the investigation."

He added: "Our thoughts remain with the families at this difficult time."