4th Child Dies After St. Paul House Fire as Mom and 2 Siblings Remain in Critical Condition

The Jan. 3 house fire in St. Paul has now claimed the lives of four of Pa Cheng Vang's six children

<p>FOX 9 Minneapolis-St. Paul/YouTube</p> Scene from a house fire in St. Paul, Minnesota, that claimed the lives of four children

FOX 9 Minneapolis-St. Paul/YouTube

Scene from a house fire in St. Paul, Minnesota, that claimed the lives of four children

A fourth child has now died following a devastating house fire last week in St. Paul, Minnesota.

The St. Paul Police Department confirmed to PEOPLE in an email that Muaj Vang, a 1-year-old boy, died Saturday evening.

The blaze previously claimed the lives of the boy's other siblings, 5-year-old twin sisters Sivntxhi Vang and Ntshiab Vang, and brother Muaj Tshav Ntaj Vang, 4, according to police.

The children’s mother and two additional siblings remained in critical condition as of Monday, CBS affiliate WCCO reported.

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According to the St. Paul Fire Department, the fire broke out in the early morning hours of Jan. 3  on the 1200 block of Arkwright St. The department said that seven people were rescued and hospitalized.

On Thursday, authorities said an unattended candle likely was the source of the fire. They previously said the smoke detectors inside the home seemed functional at the time.

Related: 4 Children Die in Connecticut House Fire: 'Tremendous Loss'

In a GoFundMe created after the incident, the children’s father said that he was at work at the time of the fire.

"When I heard the news from the police about my family while I was at work, I rushed home with empty words of emotion," wrote Pa Cheng Vang. "All my 6 children and wife were sent to the hospital."

Vang, who had just enjoyed celebrating the New Year as a family, went on to say he still can't believe that was "the last time I spent with my kids."

Related: 5 Children Aged 13 and Under Killed in Arizona House Fire

Vang has since spoken out about the importance of fire safety.

"Moving forward, I hope that everyone can start [that] practice so that I never see any news on TV or social media that your family has the same condition as my family," he said at a press conference Saturday, the Star Tribune reported.

Related: 2 Children Killed in Mich. House Fire: 'I Only Can Imagine What the Mom's Feeling,' Says Neighbor

The GoFundMe, which will cover funeral expenses, has raised over $420,000 as of Tuesday.

"I am wholeheartedly grateful for the support, prayers, and donations during this incredibly difficult time," Vang wrote, "I greatly appreciate everyone for helping."

The St. Paul Police Department told PEOPLE Tuesday that the fire remains under investigation and "is still considered a tragic accident."

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