On 9 March 1991, demonstrations were held against Slobodan Milošević in Belgrade, but the police and the military were deployed in the streets to restore order, killing two people. In late March 1991, the Plitvice Lakes incident was one of the first sparks of open war in Croatia. The Yugoslav People's Army (JNA), whose superior officers were mainly of Serbian ethnicity, maintained an impression of being neutral, but as time went on, they got more and more involved in state politics.