Alternative sources:

Former IDF soldiers attack pro-Palestinian student protesters at Columbia University

https://www.wsws.org/en/articles/2024/01/22/lfsy-j22.html

Columbia Students Allegedly Sprayed With Putrid Chemical at Pro-Palestine Rally

https://www.thedailybeast.com/columbia-students-allegedly-sprayed-with-putrid-chemical-at-pro-palestine-rally

Columbia Scolds Students for “Unsanctioned” Gaza Rally Where They Were Attacked With Chemicals

https://theintercept.com/2024/01/22/columbia-university-palestine-protest-skunk/