A shooting at an 18-story Dallas office building injured at least three people, according to local news reports. The shooting took place at 11 a.m. at a building that houses several businesses, including the United Texas Bank. Fox News says the man shot a 63-year-old father and his 39-year-old son, both of whom are in stable condition, before shooting himself. Apparently, the shooter, who is in "very critical condition," knew both of his victims. Bank employees locked themselves in the vault when the shooting began.