According to the fire service, a wall of rock toppled on top of motor boats below a waterfall in southern Brazil on Saturday, killing at least seven persons and badly injuring nine more.
At Capitolio, Minas Gerais, a tower of boulders abruptly broke free from the canyon wall and slammed onto six recreational boats, causing a massive wave to break over the lake.
Tourists shouted as the column of rock smashed into the ocean, destroying two boats, according to videos uploaded on social media.
Three persons are still missing, according to authorities, despite the fact that others who were thought to be lost were found by phone. Divers combed the water for clues.