BRASILIA, Brazil—A towering slab of rock broke from a cliff and toppled onto pleasure boaters drifting near a waterfall on a Brazilian lake and officials said at least six people died.
Edgard Estevo, commander of the Minas Gerais State Fire Department, said at a news conference that in addition to the dead as many as 20 people might be missing and officials were seeking to identify them after the accident Saturday.
