(Aloha, OR)  --  Police are looking for a man who reportedly pulled down a 17-year-old girl's pants near a school-bus stop in Aloha.  Police say a man, believed to be in his 20s, ran up behind the teen and pulled her pants down part-way before he ran.  Investigators say the incident, which happened Tuesday morning in the area of Southwest Blanton Street and 160th Avenue, has similarities to other incidents reported in the area.  The suspect in the latest incident is described as being average in height and weight and wearing a black hoodie and black athletic shorts.