FORT WORTH, Texas—An 18-year-old student was indicted Friday on attempted murder and aggravated assault charges for an Oct. 6 shooting at a Dallas-area high school that wounded two students and a teacher. The Tarrant County grand jury’s indictment also accuses Timothy George Simpkins of unlawfully carrying a weapon in a prohibited place at Timberview High School, which is in Arlington but belongs to the school district in neighboring Mansfield. Police say Simpkins opened fire in a classroom after a fight with a 15-year-old student who was among those wounded. Simpkins’ family said he had been bullied and robbed twice at school. Simpkins’ attorney, Lesa Pamplin, declined to comment on the indictment.