Eighteen months later, more information has been made public about the killing of U.S. Border Patrol Agent Brian Terry. The Feds are asking for the public's help in order to find suspects still at large.

FOX News Radio's Jessica Rosenthal reports from Los Angeles:

While two suspects are in custody for the murder of Brian Terry, Southern California U.S. Attorney Laura Duffy announced the names of four more people they're looking for. She says they're likely in Mexico. Duffy says the case is complex enough without what she called unprecedented atmospherics in Terry's case.

Duffy: "I want the Terry family and the Border Patrol to know that those atmospherics have not distracted the efforts of this prosecution team."

Weapons used to kill Terry were traced back to the ATF's failed Fast & Furious gun walking operation which resulted in a Republican led House vote to hold the Attorney General in contempt of Congress.

Jessica Rosenthal, FOX News Radio.

Editor's Note: The Justice Department announced a reward of up to $1 million for information leading to the arrest of those suspects still at large. Anyone with information concerning the whereabouts of the fugitives should contact the FBI's Phoenix field office at (623) 466-1999. You may also contact your local FBI office or the nearest American Embassy or Consulate.  For more visit justice.gov

Click HERE to see the FBI's press release with more details on the fugitives.

Brian Terry's Family released the following statement via their website honorbrianterry.com:

"It has been a difficult 18 months for the family since Brian Terry was murdered in December of 2010 and today's announcement provides hope that justice will eventually be served," said Robert Heyer, Chairman of the Brian Terry Foundation and cousin to Brian Terry. "The Terry family would like to thank U.S. Attorney Laura Duffy and her team of prosecutors along with the special agents of the FBI's Tucson Office and the Mexico City Legal Attaché who have continued to pursue leads in the murder case that ultimately led to the additional indictments of the four fugitive defendants. The Terry family would also like to thank the government of Mexico for their assistance in the investigation. It is the family's hope that the unsealing of details in the case, the identification of the four fugitives and the issuance of reward monies will lead to the eventual capture of all individuals responsible for the murder of Agent Terry."

"Today's developments certainly mean that the criminal prosecution of Brian Terry's killers is moving forward," said Terry family attorney Patrick McGroder. "However, the accountability aspect of Operation Fast and Furious, the flawed ATF/DOJ gun trafficking investigation that put weapons into the hands of the men that killed Brian Terry, remains stalled. The Terry family once again asks that the Attorney General and the Department of Justice comply with the request for documents made by the House Oversight and Government Reform Committee so that all Americans can know who approved of the operation in order that those individuals can be held accountable for their decisions. Agent Terry died as a hero protecting this country; he and his family rightly deserve a full and thorough explanation of how Operation Fast and Furious came to be."

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