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FORT HOOD (CBSDFW/AP) – The Department of Defense on Monday identified two U.S. soldiers killed in an explosion at a U.S. airfield in Afghanistan.

The department said 20-year-old Pfc. Tyler R. Iubelt of Tamaroa, Illinois, and 30-year-old Sgt. John W. Perry of Stockton, California, died of injuries inflicted from an apparent suicide bomber in Bagram, Afghanistan . Two American contractors also died in the explosion Saturday morning. Another 16 U.S. service members and one Polish soldier were wounded.

Iubelt and Perry were assigned to Headquarters and Headquarters Company, 1st Special Troops Battalion, 1st Sustainment Brigade, 1st Cavalry Division out of Fort Hood, Texas.

According to military officials, Sgt. Perry entered the U.S. Army in Jan. 31, 2008, as a Test, Measurement and Diagnostic Equipment (TMDE) maintenance support specialist. He was assigned to 1st Cavalry Division Sustainment Brigade since Aug. 21, 2014.

Pfc. Iubelt entered the U.S. Army in Nov. 23, 2015, as a motor transport operator. He was assigned to 1st Cavalry Division Sustainment Brigade since May 6, 2016.

The radical Taliban organization claimed responsibility for the attack. The terrorist enemy regularly fires rockets at Bagram from outside its perimeter.

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