The three soldiers destroying the ammunition, belonging to the US Army V Corps, were rushed to a field hospital for medical attention after the Saturday accident.

An investigation is underway, the Central Command said in a statement from Doha, adding no further details.

Also Saturday two US soldiers were injured when assailants fired a rocket-propelled grenade at their transport truck near the town of Habbaniyah.

The injuries were not life threatening, the statement read.

In a separate Saturday incident, assailants also armed with a rocket propelled grenade attacked a US Army tanker truck at a Baghdad fuel depot.

The tanker -- which the command said was "on a humanitarian assistance fuel mission" at the time -- was destroyed, but there were no US or civilian casualties, officials said.

US Marines detained four Iraqis for questioning, the Central Command said.

On Tuesday two US marines were killed when unexploded ordnance they were handling detonated.

And on Wednesday nine Iraqi children were killed and seven wounded in southern Iraq when a rocket they were playing with exploded.

WAR.WIRE