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Four US citizens who were teaching at a Chinese university were stabbed Monday in Jilin City, according to officials.

The incident occurred when a 55-year-old man named Cui was walking in Beishan Park and had an altercation with a foreigner, leading him to stab the individual and three companions. A Chinese citizen who attempted to intervene was also stabbed, as reported by local police. Officials believe that the attack was an “isolated incident.”

Jonathan Brand, president of Cornell College, issued a statement acknowledging the incident and confirming that the teachers were visiting a public park with a faculty member from Beihua University at the time. Adam Zabner, an Iowa House of Representatives member, revealed that his brother, one of the instructors, was also injured in the arm. He mentioned that his brother is recovering and expressed the family’s desire for his swift return to Iowa.

In a brief statement, the State Department said they were “aware of reports of a stabbing incident in Jilin, People’s Republic of China.” They added, We are monitoring the situation and have no further comments at this time.”