(Lake Oswego, OR)  --  School district officials say longtime Lake Oswego High School basketball coach Mark Shoff has been fired.  Officials say Shoff was relieved of his duties following an investigation into "concerns" raised at last week's Les Schwab Invitational Tournament.  No details of those concerns have been released.  The school district says Lake Oswego will hire an interim coach for the remainder of this season and will conduct a search for a permanent head coach in the spring.