The specific details—starting around 10:30 p.m. in a commercial building on Jefferson Street in Newark’s Ironbound neighborhood and spreading to four neighboring structures, including at least three multifamily homes—are not independently corroborated by the provided evidence. The web search results mention Newark's Ironbound neighborhood and fires in the area, but do not confirm these precise details.

The specific details regarding the fire being under control before 3:30 a.m. and injuring six firefighters with non-life-threatening injuries are not independently corroborated. While the general theme of injuries and fire control is present in the context of the event, these precise metrics are only suggested by the evidence count/context, not confirmed by multiple independent sources.

The claim that 'About 60 terrified residents escaped unharmed' is directly quoted from one web search result, but no other independent source confirms this specific number or outcome for the residents.

The specific detail about displaced residents returning on Saturday morning to clean up debris and salvage belongings, as reported by PIX11, is not corroborated by other sources. Other web results mention residents returning after flooding or general displacement, but not this specific scenario.

The specific detail that the American Red Cross assisted at least 15 families with temporary lodging, clothing, food, and other immediate needs is only present in one web search result. While Wikipedia confirms the existence and mission of the American Red Cross, it does not confirm this specific assistance count.