Updated at 7:44 a.m. Thursday to reflect that the body has been identified as Jacqueline McDonald, the 89-year-old woman reported missing after the fire.

Jacqueline McDonald

The body found in a North Dallas condo building after a massive blaze tore through it over the weekend has been identified as the 89-year-old woman reported missing Saturday.

The Dallas County medical examiner's office identified the victim as Jacqueline McDonald, a woman with dementia whose body was found near her condo Monday. They have not yet determined her cause of death.

The four-story Preston Place condos in the 6200 block of West Northwest Highway went up in flames late Friday night in a seven-alarm fire. Crews were continuing to extinguish hot spots this week but had to battle visible flames coming from the top of the structure about 1 a.m. Wednesday.

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Though the fire from debris early Wednesday morning wasn't very large, ladder pipes were used to dump water on top of the flames again, Dallas Fire-Rescue spokesman Jason Evans said.

Crews extinguished the visible fire relatively fast, but stayed on scene and continued to apply water to the site for about three or four more hours, he said.

Body found, but it hasn't been removed yet. Crews now up on ladder overlooking the charred building & debris in missing woman's condo. pic.twitter.com/oySOBquYmw — Vanessa Brown (@VanessaBrownTV) March 6, 2017

The fire displaced about 100 residents.

"I'm just worried about if everybody got out," said Nancy Shipman, who lives nearby and was walking her dachshund, Blue, past the still-smoldering wreckage Saturday evening. "I started wondering, what would I do? What would I grab and try to take? I'd grab Blue."

McDonald was last seen shortly before 11:30 p.m. Friday, when Dallas Fire-Rescue crews were called to the condos near Preston Road.

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Late Friday, the residents of the complex, most of them elderly, calmly exited the building as the flames spread and firefighters' response escalated, Evans said.

By early Sunday afternoon, crews were working to extinguish hot spots in what remained of the 60- unit condominium complex. The fire was put out by 5 p.m.

"We remain concerned about the overall structural integrity of the building, " Evans said. "We continue to observe isolated collapses throughout the building and have our eyes on the possibility of others going forward."

One person was taken to a hospital with medical issues exacerbated by the fire and smoke but is expected to be OK, Evans said.

The area where some nearby resident say they think it started pic.twitter.com/RgrEIUi71H — Eline de Bruijn (@debruijneline) March 5, 2017

#RedCross is assisting about 100 people displaced by tonight's 7-alarm fire in #Dallas to ensure they have food, shelter and necessities. pic.twitter.com/gDbZwN2W7Y — American Red Cross Greater North Texas (@RedCrossNTX) March 4, 2017

Lorrie Smith lives in a nearby apartment complex and could feel the heat of the fire through her walls "like a bonfire." She called the Red Cross to let them know about the residents she saw outside, many of them barefoot and in nightgowns.

"I didn't know anyone who lived there," she said. "You just pitch in as a neighbor."

Smith helped a family by bringing them into her apartment and giving them food, water and her boyfriend's T-shirt for their two young boys, clad only in superhero underwear. They asked to see pictures she had taken of the complex burning.

"They were saying, 'That's our house,' " Smith said.

One of the boys had a birthday earlier in the week, and Smith said he was sad thinking about the new light-up sneakers he lost in the flames. The other boy lost the money he was saving to buy a watch.

"I gave them some toys from my nieces, and they were playing and talking about school," Smith said.

Smith said many people didn't know the phone numbers of their loved ones or family members. That made Shirley Covington, who also lives nearby, think twice about being prepared.

"It's devastating," said Covington, who has lived in a nearby complex since 1975. "I thought about the small animals and people in their nightgowns barefoot."

Here's an aerial view of the damage at Preston Place Condos. Firefighters still working to put out fire nearly 10 hrs later @FOX4 pic.twitter.com/SzU6eCauvh — Shannon Murray (@ShannonMFox4) March 4, 2017

Punctuating firefighters' efforts Saturday were isolated collapses throughout the structure.

"The more the building is subjected to, the more we have to confront the reality that there may not be anything salvageable left when it's all said and done," Evans said.

The cause of the fire has not been determined, and investigators will have limited access to the complex because of the damage.

Staff writer Julieta Chiquillo contributed to this report.