At least three people including a police officer lost their lives and seven others were injured in two separate shooting incidents across the United States, a report said. In the bloodiest incident, three people including an off-duty police officer were killed after an unidentified gunman opened fire inside a Northern Ohio nightclub, press tv reported. The deadly shooting took place in at the Last Call Saloon in Fremont located some 56 kilometers South of Toledo. A fourth person also sustained injury in the incident. 25-year-old Ramiro Arreola was airlifted to a nearby hospital. Police have made no arrests and are still searching for the gunman who fired four shots and killed a 25-year-old bartender, a 24-year-old patron and the 26-year-old police officer. It is sad that an altercation in a bar went so terribly out of control. I am sad for all of the victims and their tragic deaths," Wiersma said. "All of the victims were from our community and, yes, one being a fellow police officer makes it even harder," said Police Chief Tim Wiersma. Meanwhile, six people were injured including a basketball star when a gunman opened fire at around 3:30 AM on Saturday night at a house party in Chicago. Two of the victims, a 20-year-old man and a 20-year-old woman, are said to be in serious condition. One of the victims was Orr Academy high school basketball star Tyquone Greer. Greer who suffered a gunshot wound to his lag is said to be in stable condition at John H. Stroger, Jr. Hospital.