RELATED: Four Americans killed, three injured in ISIS blast in Syria
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Two U.S. servicemembers, one Department of Defense civilian and one contractor supporting the Department of Defense were killed.
The Islamic State group claimed responsibility, saying one of its members carried out a suicide attack. In addition to the Americans, at least a dozen other people died, according to observers.
Here are the details the Department of Defense has shared so far.
Army Chief Warrant Officer 2 Jonathan R. Farmer
The 37-year-old was a married father of four from Boynton Beach, Florida, according to the DOD.
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A Green Beret and Purple Heart recipient, Farmer has a number of awards and decorations for his service. He had served on six overseas combat tours.
Famer joined the Army in 2005 at age 23 and graduated his Special Forces Qualification Course in 2007. He has been assigned to the 3rd Battalion, 5th Special Forces Group (Airborne) out of Fort Campbell in Kentucky ever since.
Farmer is also survived by his parents.
Navy Chief Cryptologic Technician (Interpretive) Shannon M. Kent
Kent was a 35-year-old sailor from upstate New York. She was assigned to Cryptologic Warfare Activity 66 and had been based at Fort Meade in Maryland.
"Our thoughts and prayers go out to the family, friends, and teammates of Chief Petty Officer Kent during this extremely difficult time. She was a rockstar, an outstanding Chief Petty Officer, and leader to many in the Navy Information Warfare Community," said Cmdr. Joseph Harrison, Commanding Officer, CWA-66.
Kent, who enlisted in 2003, had served on assignments based in Georgia, Virginia, Washington D.C. and Maryland. She had a number of awards and decorations, including the Joint Service Commendation Medal.
"Chief Kent's drive, determination and tenacity were infectious. Although she has left us way too soon, she will not be forgotten, and her legacy will live on with us," said CWA 66 Command Senior Enlisted Leader, Senior Chief Cryptologic Technician (Collections) Denise Vola.
DOD civilian Scott A. Wirtz
Wirtz, of St. Louis, Missouri, was assigned to the Defense Intelligence Agency as an operations support specialist.
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DOD contractor Ghadir Taher
Defense contractor Valiant said in a statement that one of its employees, Ghadir Taher, was killed in the attack: "We are extremely saddened by the tragic and senseless passing of Ghadir Taher. Out of respect to her family, we will make no further comment at this time other than to say she was a talented and highly-respected colleague loved by many who will be dearly missed."
ABC News and the Associated Press contributed to this report.