New Delhi, May 15 -- The United States plans to indict Cuba's Raul Castro, a U.S. Department of Justice official said late on Thursday.

The timing of the potential indictment, which would need to be approved by a grand jury, was not immediately clear, but the official said it sounds imminent.

The potential indictment of the 94-year-old former president of Cuba and brother of Fidel is expected to focus on the downing of aircraft, the official said on condition of anonymity.

CBS previously reported that the case relates to Cuba's deadly 1996 shootdown of planes operated by humanitarian group Brothers to the Rescue.

Representatives for Cuba's foreign ministry did not immediately respond to a request for comment outside of normal business...