Tonnes of debris has been removed from the site

The Crown Office said investigations at the 2000 sq metre explosion site in Maryhill had been largely concluded.

Five men and four women were killed and dozens were seriously injured following the blast on 11 May at ICL/Stockline Plastics.

Tonnes of debris have been removed from the site for detailed examination.

The rubble is being assessed as part of a joint investigation involving the Crown Office and Procurator Fiscal Service, Strathclyde Police and the Health and Safety Executive (HSE).

Last week the Crown Office confirmed it had handed control of the Stockline building, which is adjacent to the devastated ICL building, and its contents back to the company.

A Crown Office spokesman said: "The investigation into the cause of the explosion continues and the investigating authorities will continue to have access to the site when necessary.

"The handover marks the end of a 10-week process to recover vital evidence from the site."

The spokesman described the investigation as "full and thorough" and said it was not possible to speculate how long it may take.