Administrators at Columbia University responded to reports of students being injured by a chemical attack against an on-campus rally for Gaza by chiding students for holding protests without official authorization. Meanwhile, students told The Intercept that even as the school’s public safety department has said it is investigating the incident, school administrators themselves have yet to contact the victims — some of whom have had to seek medical care for their injuries. During a rally on Friday, according to attendees, two individuals sprayed a hazardous chemical that released an odious smell. Dozens of students have reported an array of symptoms,...