A fire briefly spread through pavilions being used for UN climate talks in Belem, Brazil and prompted evacuations Thursday on the next-to-last day of the conference, and officials said 13 people were treated for smoke inhalation, AP reports.

Organizers said the fire was controlled in about six minutes. Fire officials ordered the evacuation of the entire site for the conference, known as COP30, and the venue remained closed for about seven hours following the fire.

Brazil’s Tourism Minister Celso Sabino told journalists at the scene that the fire started near the China Pavilion, which was among several pavilions set up for events on the sidelines of the climate talks. Video footage showed the blaze starting along a wall near a cluster of many of the Africa pavilions and the Climate Live Entertainment + Culture Pavilion.

The fire quickly spread to neighboring pavilions, said Samuel Rubin, one of the people in charge of the Climate Live pavilion.

Video showed huge flames in one of the pavilions, which are reinforced canvas or fabric structures that typically have three walls and a floor.

Para state Governor Helder Barbalho told local news outlet G1 that a generator failure or a short circuit in a booth may have started the fire.