which congressional body indictments of accused federal officials, like president?

The Grand jury is the jury that issues indictments in federal felony cases. Grand juries are only used in the United States.

3 years

PETIT jury . . . as opposed to a GRAND jury which hands down indictments.

Grand juries do not decide guilt or innocence. They determine if enough evidence exists to formally charge you with a crime. There are two types of formal charges: presentments and indictments. For all practical purposes nowadays only indictments are produced by grand juries.