The United States is moving to indict former Cuba President Raúl Castro on potential charges in a 30-year-old case involving the downing of two humanitarian planes.

The potential indictment — which must be approved by a grand jury — is expected to focus on Cuba's 1996 downing of two planes operated by a humanitarian group.

The US government is weighing a federal indictment against former Cuban president Raúl Castro over the 1996 downing of two civilian aircraft operated by the humanitarian…