The bureau posted photographs of the three people and said they may be able to provide information to help in the investigation. The attack on Sept. 11, 2012, killed the U.S. ambassador and three other Americans
"We need your help to solve this crime," the FBI said.
In a posting on the FBI's website, the law enforcement agency urged anyone with information to text or e-mail BenghaziTips(at) ic.fbi.gov or to submit information confidentially at https://forms.fbi.gov/benghazi-en.
Republicans in Congress continue to question the Obama administration about the attack.