The killing of one teenage girl and the disappearances of two others who have since returned home may all be connected and may be gang-related, Fairfax County police said Tuesday.(snip) Damaris’s mother, Maria Reyes, told The Washington Post on Tuesday that her daughter had fallen in with a local clique of MS-13, before her disappearance from the family home Dec. 10. On Jan. 6, Damaris appeared to have been sent warnings that gang members wanted to kill her, according to Facebook messages her mother shared with The Post. “Those suckers want to kill you,” read one Facebook message, while another...