(CNN)One person is missing and four others were injured in what is believed to be an electrocution incident at an Arizona lake Sunday.
Two people were transported in critical condition to a hospital from Scorpion Bay Marina on Lake Pleasant in Peoria Sunday, said Capt. Mario Bravo of the Peoria Fire Department during a press briefing. Two additional victims refused aid at the scene, Bravo said.
The Maricopa County Sheriff's Office is working to retrieve the body of a fifth victim from the lake, according to Bravo.
Lake Pleasant is about 40 miles northwest of Phoenix.
Bravo said that firefighters were dispatched for a call of a drowning but received additional information while en route that suggested the incident could have been an electrocution.
Firefighters had to wait about eight to 10 minutes until the electricity was secured before they could enter the water at the marina, Bravo said.
It is unclear what caused the electrical current and the sheriff's office is investigating the incident, which is believed to be isolated, according to Bravo.