Police will carry out a "painstaking" search of the Stockline Plastics site as they attempt to establish the cause of the blast which killed nine people.
Forensic experts prepare to examine the scene of the blast
The final body was pulled from the rubble of the Glasgow plant on Friday.
Detective Superintendent Jim Porteous said he was not in a position to say whether Strathclyde Police would be carrying out a criminal investigation.
But the senior investigating officer promised that a "full and thorough investigation" would be carried out.
He said the force's inquiries were at an early stage and the cause of the explosion was unknown.
"During the rescue and recovery operation, a large number of officers have been working behind the scenes to gather potentially vital information," he explained.
"Detectives are already interviewing witnesses, including victims and employees, to try and piece together what happened.
"Officers will also be carrying out door-to-door inquiries and will be speaking to local residents and businesses. CCTV footage from the surrounding area will also be examined."
He said specialist scene managers had been appointed shortly after the explosion to ensure that no information was lost.
GLASGOW BLAST VICTIMS
Margaret Brownlie, 49, Strathaven
Annette Doyle, 24, Glasgow
Peter Ferguson, 52, Kilbarchan
Thomas McAulay, 41, Mount Florida, Glasgow
Stewart McColl, 60, West Kilbride
Tracey McErlane, 27, Possilpark, Glasgow
Kenneth Murray, 45, Paisley
Timothy Smith, 31, Johnstone
Ann Trench, 34, Colston, Glasgow
"Obviously there is a great deal of potential evidence amongst the debris and a painstaking search will be carried out of the entire site," said Det Supt Porteous.
"I can give an assurance that all the relevant agencies will continue to work together to determine the cause of this tragedy.
"Our family liaison officers will be in constant contact with relatives and will keep them updated of any
Lord Advocate Colin Boyd visited the scene of the explosion on Friday to express his sympathies to the families of the victims and thank those involved in the rescue effort.
He is the head of Scotland's prosecution service, which is responsible for deciding whether criminal proceedings and/or a fatal accident inquiry should be held following sudden, suspicious or unexplained deaths.
"I know that the procurator fiscal in Glasgow will be in contact with each of the bereaved families personally to explain the process of investigation that will now take place, and to offer a meeting with the fiscal and with staff from our Victim Information and Advice service," he said.
Floral tributes have been left at the site
"Today I have had the opportunity to see the scale of the disaster and to hear from the procurator fiscal and the emergency services about the efforts they have been making to begin to piece together the facts about the cause of this tragedy."
He said a "full and thorough" investigation into the cause of the explosion was under way.
"This may take some time, but it is important that we learn any lessons we can from this tragedy," said Mr Boyd.
"As the first minister confirmed to parliament yesterday, it is too early at this stage to say what form an inquiry might take and whether that will be a fatal accident inquiry.
"But I can confirm that there will be an appropriate form of inquiry, and that it will be public."