I want to know the answer to the following question:
Where did the attack occur?
All the background I'm provided with is that "On October 15, several thousand people gathered in Chervonohrad, Chernivtsi, Rivne, and Zhytomyr; 500 in Dnipropetrovsk; and 30,000 in Lviv to protest the election law.". Is that enough to answer the question?