Central Arizona Fire and Medical crews responded to an explosion at a residential tri-plex in Prescott Valley Thursday night. Crews arrived at the building in the eight-thousand block of Lakeshore Drive at around 8:42 p.m. and saw damage to the building. Gas and electric crews turned off gas and power to the complex. Residents were able to get out of the building with no injuries. Arizona Crisis Team members arrived to help assist the residents. The cause of the explosion is not known and it remains under investigation.