ST. LOUIS (AP) -- A St. Louis Army lieutenant was among four soldiers killed in a roadside bombing in Iraq, the Defense Department said Tuesday.

The St. Louis man is 1st Lt. Daniel Riordan, 24. He and three others died Saturday when an improvised explosive device detonated near their vehicle in Taji. They were based at Fort Hood, Texas.

The others killed were Sgt. Joel House, 22, of Lee, Maine; Sgt. Jimy Malone, 23, of Wills Point, Texas and Spc. Derek Calhoun, 23, of Oklahoma City.

The soldiers belonged to the 1st Cavalry Division's 2nd Battalion, 8th Cavalry.