Several homes surrounding the area of a deadly house explosion in an east Mississauga neighbourhood will likely have to be torn down, Mississauga Fire Chief Tim Beckett says.

At a press conference on Monday, Beckett said that engineers and building officials have been surveying the area to determine the damage caused to surrounding structures and whether some homes can be salvaged.

“We now have reports of damage in some adjacent buildings or homes and that information is starting to filter in. So we’re starting to put that on a map so we can determine the whole magnitude (of the blast),” Beckett said.

“So what I can tell you is that this was a big explosion and that the damage that has occurred varies.”

On Friday, Peel Regional Police confirmed that the body of 55-year-old Robert Nadler was located in the rubble of 4201 Hickory Drive after an explosion levelled the home and sent pieces of debris flying across the neighbourhood.

The body of a woman, identified as that of 55-year-old Dianne Page, was found at the site last week.

Nadler and Page were the two people associated with the home where the explosion occurred, police said.

Though the investigation is ongoing, a release issued by the City of Mississauga on Sunday night indicated that the ‘on-site portion’ of the probe is complete and the city’s recovery plan is now underway.

The cause of the explosion has not yet been determined.

“Now it turns to the analysis of the evidence we’ve collected,” Sgt. Josh Colley said.

Colley said Monday that experts are analyzing hand-written notes that were found strewn near the blast site. The notes appeared to be written by someone in distress and are expected to undergo a handwriting analysis.

"I think I spoke earlier about hand-writing analysis. The biggest portion is making sure that the letters are associated to the right addresses. There have been numerous houses that were destroyed. We just have to make sure what we have recovered thus far, we can put back to the specific addresses."

“They want to be certain when a determination is made – whether deliberate or accidental – so that will take some time,” Colley added.

Police sources told CTV Toronto that Nadler was convicted of murder in the City of Mississauga in the 1980s. Investigators have refused to comment on the reports.

Dozens of people were evacuated from the neighborhood following the blast which occurred in the area of Eastgate Parkway and Dixie Road on Tuesday just before 4:30 p.m.

Beckett said that 69 addresses in total are still covered by an evacuation zone around the blast site but that many residents will be allowed back into their homes in the coming days.

"Some of them will be able to enter their home on a 15-minute supervised visit to grab personal needs. The homes will then be turned over to their insurance companies so that they can be boarded up and secured."

“We will provide support for the residents and the critical incident stress associated with this Hickory Drive incident,” Beckett said.

He added that it has been an "emotional time" for those affected by the explosion.

The Burnhamthorpe Community Centre -- which was previously used as a shelter and information hub for residents impacted by the explosion -- has been replaced by a mobile unit on Hickory Drive near Rathburn Road East and Dixie Road as of this morning.

The mobile information hub is expected to be open until Wednesday.

A community support session will also take place sometime this evening for residents impacted by the explosion.