Federal investigators say other people may have been involved in the deadly attempted robbery of a bank in Cairo.

Search warrants from the FBI say authorities believe 30-year-old James Watts may have had help in the robbery May 15 at the First National Bank branch in Cairo. Those assistants are still on the loose.

The surviving victim in the attack told authorities Watts was using a two-way radio to communicate with someone during the attack. Authorities say they confirmed this through video surveillance.

Anita Grace and Nita Smith died in the attack. Watts faces the death penalty if convicted.