What event occurred in Tiananmen Square in 1989?

I say Pro-democracy protesters were killed by government troops.

You're correct. The event that occurred in Tiananmen Square in 1989 was a pro-democracy protest in Beijing, China. Thousands of students and other citizens gathered in the square to demand political reform and greater freedoms. However, the Chinese government declared martial law and sent troops and riot police to suppress the protest. On June 3-4, 1989, the military crackdown took place, during which soldiers armed with rifles and tanks were deployed to disperse the demonstrators. The exact number of casualties remains unclear, but it is widely believed that hundreds or even thousands of protesters lost their lives during the violent crackdown. The Chinese government has since heavily censored discussions and documentation of the event within China. To find more specific and detailed information about this event, you can refer to historical records, eyewitness accounts, news articles, books, documentaries, and other credible sources.