(Plymouth, WA)  --  Five people are injured following an explosion at a liquefied natural gas plant in Benton County, Washington.  Officials say shrapnel from yesterday's blast at the Williams Northwest Pipeline Gas Plant punctured a tank that contained about seven-million gallons of liquid natural gas.  A two-mile-radius evacuation order was issued, but that was later reduced to one mile.  None of the injuries is considered life-threatening.