(Portland, OR)  --  More than half a dozen minors are facing charges following an assault on a MAX train in Portland.  Police arrested the seven juveniles for the assault involving a knife yesterday afternoon at the Holgate Boulevard transit station.  The juveniles allegedly assaulted a man, leaving him with non-life-threatening injuries.  The suspects range in age from 13 to 16.  They were booked into the Donald E. Long Juvenile Detention Center.