Laguna Woods is a community in Southern California of about 16,000 people.
The shooting occurred at the Geneva Presbyterian Church, an NBC affiliate in Los Angeles reported. According to the AFP news agency, one death and four serious injuries have already been confirmed.
Fire and rescue personnel were at the scene, treating and transporting several patients to the hospital, the Orange County Fire Authority said.
The sheriff’s department was not immediately available for further comment.
Yesterday, an 18-year-old gunman shot dead 10 people and wounded three others at a grocery store in Buffalo, New York state.