The U.S. could announce a possible criminal indictment of former Cuban president Raul Castro in the coming days, sources familiar with the matter said.

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…