A least seven people, including four children, were injured in a shooting incident that took place in the city of Crete, in the US state of Nebraska.Local police said that a 74-year-old man opened fire on his neighbors from inside his house, wounding seven people, including four children, before committing suicide.The injured adults were between 22 and 43 years old, while the children were between 3 and 10 years old, police clarified.The police said that investigations are underway to determine the motives and details of the incident.The United States witnesses frequent shooting incidents driven by various motives, making the issue of widespread gun ownership among the population one of the most contentious issue.