The Bulletin of the Atomic Scientists says the world is as close as it has ever been to self-annihilation. It has left its Doomsday Clock set at 90 seconds to midnight.
The group made the announcement on Tuesday in Washington.
The clock was created 77 years ago by Albert Einstein and J. Robert Oppenheimer, among others, to warn people about the threats from nuclear weapons.
Last year, the group cited "unprecedented danger" from the war in Ukraine, with Russian leaders threatening to use nuclear arms. It set the clock to the closest it has ever been to midnight.
The group says the level of risk has not changed. However, it points to other potential nuclear crises, including one stemming from North Korea. Rachel Bronson, the president and CEO of the Bulletin of the Atomic Scientists, says the country is becoming "more belligerent and aggressive."
Bronson added that the fighting between Israel and Hamas has the potential to escalate into a "broader conflict."
She pointed to what she described as other "existential threats," including climate change and artificial intelligence. She said it is important that people express their views so leaders take steps to keep them safe.