Police in a Phoenix suburb say three people, including a teenager, were killed and five others were injured after a shooting outside a crowded concert and car show

The fatal shooting Sunday night at a restaurant and event venue in Glendale, Arizona, was an “isolated incident that involved individuals that were known to one another,” the city manager’s office said in an update Monday.

Police believe there was more than one shooter involved. Investigators did not have a suspect in custody but multiple people were being questioned.