The incident occurred shortly before 10 p.m. Monday and involved Marines with the 2nd Marine Division, according to the 2nd Marine Expeditionary Force based at Camp Lejune, N.C.
Senate Majority Leader Harry Reid (D-Nev.) acknowledged the Marines killed on the Senate floor Tuesday.
“My thoughts are with those who were injured. My heart goes out to the families of those who lost their lives. And my sympathies are with their fellow Marines, who are also grieving this loss," Reid said.
Sen. Dean Heller (R-Nev.) tweeted: “Thoughts and prayers are with the families who lost a loved one in the Hawthorne Army Depot explosion. Grateful for their service.”
The Hawthorne Army Depot is used to demilitarize ammunition and spans nearly 150,000 acres.