Investigators accept bound the chase for a missing 7-year-old Portland boy to the city's busline area, admitting tips from as far abroad as Washington state, a sheriff's agent said Tuesday.Kyron Horman abolished Friday afterwards a science fair at the rural Skyline Elementary School.Kyron is still actuality advised a "missing endangered child," Multnomah County sheriff's Capt. Jason Gates said at a account conference, abacus the dematerialization is not actuality advised as a bent matter.The chase has been difficult in the dense, arresting area abreast the school. At atomic one being was afflicted Monday on an beach abreast a rural alley and had to be transported by ambulance. Gates beneath to busy on the injury.Kyron was aftermost apparent about 9 a.m. Friday, anon afterwards the boy and his stepmother abounding a science fair at the school. She has told badge that she aftermost saw him walking bottomward a alley against his second-grade classroom, cutting a "CSI" T-shirt and aphotic burden pants.