Law Officers are considering charges over the explosion at Haut du Mont that killed ten people nearly two years ago.
Jersey Police and the Health and Safety Inspectorate have passed their case files of evidence to the Law Officers Department (LOD) - the island's prosecution service.
The files contain a collection of documents and expert opinions relating to Operation Spire.
The Law Officers will consider whether any criminal charges should be brought over the fatal blast at the flats on Pier Road on 10 December 2022.
The ten residents who died were Raymond (Raymie) Brown (71), Kathy McGuinness (73), Peter Bowler (72), Ken Ralph and Jane Ralph (72 & 71), Billy Marsden (63), Derek Ellis and Sylvia Ellis (61 & 73), and Romeu De Almeida and Louise De Almeida (67 & 64).
Two criminal investigations have been running side by side.
Police say their work has involved with 2,024 lines of enquiry followed, 1,158 statements taken and 1,988 exhibits collected.
Last week it was revealed that the government has spent £11.6m on the response to disaster since it happened.
Three men, arrested in August 2023 on suspicion of gross negligence manslaughter, remain on police bail.
A statement says, "...the investigation teams continue to gather material and undertake further enquiries.
"Family liaison officers continue to support the bereaved families."
Since the tragedy, Blocks G, I and J of Haut du Mont have been demolished and Pier Road has reopened.
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