A Ukrainian citizen attacked people with a knife at a monastery in Ярославі, Poland, on September 24, around 09:30. Initially, police received a report of an attack on one man. Upon arrival, law enforcement discovered five victims: four men and one woman, all of whom were hospitalized. A priest, among the injured, later died.

The condition of two other victims was assessed as very serious. The incident occurred on the grounds of the Benedictine Sisters' monastery on вулиці Бенедиктинській.