The COP30 United Nations climate talks in Belém, Brazil, were evacuated Thursday night after a fire broke out inside the main venue.

The incident forced thousands of attendees to leave the area as emergency crews moved in to contain the flames.

According to organizers, smoke and flames spread through the pavilion area as temperatures rose and security personnel directed delegates toward exits.

Fire crews entered the affected zone while security staff formed a human barrier across the hallway to keep the evacuation route clear.

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Reuters reported that security footage showed flames spreading quickly along an internal fabric shell that lined the building’s walls and ceiling.

The fire was extinguished shortly afterward.

Organizers said thirteen people were treated at the venue for smoke inhalation.

Medical teams provided support on site, and the individuals’ conditions were monitored following treatment.

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The local fire service said the blaze was likely caused by electrical equipment, identifying a microwave as a probable source.

Fire officials reported that the flames were brought under control within six minutes.

Videos posted from the scene showed emergency responders working to extinguish large flames as thick black smoke rose from the structure.

In a statement released Thursday evening, organizers said, “Earlier today, a fire broke out in the Blue Zone of the COP30 venue in Belem. The fire department and UN security officers responded swiftly, and the fire was controlled in approximately six minutes. People were evacuated safely.”

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They added, “Thirteen individuals were treated on site for smoke inhalation. Their condition is being monitored, and appropriate medical support has been provided.”

A follow-up statement said, “Following a safety assessment, we inform you that the site has been inspected and deemed safe by the Fire Department.”

Roughly 50,000 delegates traveled to Brazil to register for COP30.

The summit includes both formal discussions and planning sessions for future climate negotiations.

President Donald Trump did not attend the event and did not send an official U.S. delegation.

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