Chicago police Officer Krystal Rivera was mistakenly shot and killed by a fellow cop during a confrontation with an armed suspect late Thursday, according to police, who continue to hold at least

Police confirmed that the only person who fired a weapon during the chase was an officer, "whose gunfire unintentionally struck Officer Rivera."

Chicago police officials say an officer killed this week was accidentally shot and killed by her partner after they encountered someone with a rifle when they chased a suspect into an apartment.