Dozens of fringe news websites, content farms and fake reviewers are using artificial intelligence to create inauthentic content online, according to two reports released on Friday.

The misleading AI content included fabricated events, medical advice and celebrity death hoaxes, the reports said, raising fresh concerns that the transformative technology could rapidly reshape the misinformation landscape online.

One report were released separately by NewsGuard, a company that tracks online misinformation.

“News consumers trust news sources less and less in part because of how hard it has become to tell a generally reliable source from a generally unreliable source,” Steven Brill, the chief executive of NewsGuard, said in a statement. “This new wave of AI-created sites will only make it harder for consumers to know who is feeding them the news, further reducing trust.”

NewsGuard identified 125 websites, ranging from news to lifestyle reporting and published in 10 languages, with content written entirely or mostly with AI tools.

The sites included a health information portal that NewsGuard said published more than 50 AI-generated articles offering medical advice.

In an article on the site about identifying end-stage bipolar disorder, the first paragraph read: “As a language model AI, I don’t have access to the most up-to-date medical information or the ability to provide a diagnosis. Additionally, ‘end-stage bipolar’ is not a recognised medical term.”