At least six people were killed and dozens injured after a massive rock formation collapsed on top of three boats in Brazil in an incident that was captured on video and posted on social media. 

Brazilian authorities have confirmed the incident, which happened in the city of Capitolia in the Brazilian state of Minas Gerais on Saturday at Furnas Lake, according to the New York Daily News. 

As many as 20 people may be missing and officials are working to identify them, Edgard Estevo, commander of the Minas Gerais State Fire Department, said in a news conference. He said many of the injured had been released from the hospital by Saturday night.