The U.S. Marine Corps has released the identities of the seven Marines killed in Monday's explosion at the Hawthorne Army Depot in Nevada. They are:

• Pfc. Joshua M. Martino, 19, Clearfield, Pennsylvania;

• Lance Cpl. David P. Fenn II, 20, Polk City, Florida;

• Lance Cpl. Roger W. Muchnick Jr., 23, Fairfield, Connecticut;

• Lance Cpl. Joshua C. Taylor, 21, Marietta, Ohio;

• Lance Cpl. Mason J. Vanderwork, 21, Hickory, North Carolina;

• Lance Cpl. William T. Wild IV, 21, Anne Arundel, Maryland;

• Cpl. Aaron J. Ripperda, 26, Madison, Illinois.

The cause of the Monday night blast was a 60 mm round that detonated inside a mortar tube, Brig. Gen. James W. Lukeman, commanding general of the 2nd Marine Division, told reporters.

The Marines said in a statement Tuesday evening that all 60 mm mortar rounds and tubes used to fire them are being pulled pending an investigation.