(Portland, OR)  --  Portland police say a brick thrown or dropped from the 12th Avenue overpass to Interstate 84 below shattered the windshield of a passing pickup truck.  Authorities say no one was injured, despite shards of glass being scattered by the impact around ten o'clock Tuesday night.  Several people were inside the pickup at the time.  Police say it's the second time within a month a falling object shattered a windshield on I-84.