CARACAS, Venezuela — The authorities in Venezuela said Wednesday that they would investigate claims that illegal Brazilian gold miners massacred a village of Yanomami Indians deep in the Amazon jungle.

It was not clear how many people may have died in the massacre. An account presented to prosecutors on Monday said that most of the approximately 80 people living in a remote village called Irotatheri were killed.

The massacre occurred in early July, according to the account, which was submitted by a Yanomami organization to prosecutors in Puerto Ayacucho, the capital of Amazonas State in southern Venezuela.

The document said that the only survivors of Irotatheri appeared to be three people who had been away from the village hunting when the miners arrived. The village sits along the upper reaches of the Ocamo River.