Lake Havasu City firefighters responded to a fire at a duplex in the 2700 block of Bluewater Drive Sunday afternoon. The fire was reported by the neighbor of the duplex. Four engine companies, a battalion chief, and two fire investigators responded to the fire and gained control of the fire in 16 minutes. The occupant of the duplex unit that was on fire was sleeping and woke up due to water flowing from the fire sprinkler system. No injuries were reported. Crews remained on the scene an additional hour conducting an investigation of the incident. Damages were confined to the unit that was on fire. The cause of the fire is under investigation.