Call it the shot heard round the tube.

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The mortar round exploded in its firing tube during the exercise, said Brigadier General Jim Lukeman at a news conference at Camp Lejeune.

NPR: Mortar Explosion In Nev. Kills 7 NC Unit Marines

Still, a number of things could go wrong from a fuse malfunctioning, a problem with the barrel's assembly to a round prematurely detonating inside the tube, he said.

NPR: Mortar Explosion In Nev. Kills 7 NC Unit Marines

The incident followed another on March 18 in which seven Marines were killed when a round detonated inside a motar tube during a training exercise at Hawthorne Army Depot in western Nevada, a military commander said at the time.

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The shell discharged in its tube but it is not clear if more than one round exploded, a Marine spokesman said.

BBC: Brig Gen Jim Lukeman

The wraparound labels on conventional round bottles were difficult to read, so she designed a flat tube-shaped container that stood upright on its cap, with plenty of room for a large, flat label that could be read easily at a glance.

WSJ: When Simplicity Is the Solution

But never mind: another round of apologies, and Middle America's churchgoing fans will settle back in front of the tube, ready to be shocked by the next scuffle.

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