Oklahoma authorities now say 13 people are dead from Friday's tornadoes and flash floods. Another seven people, including five children, are missing.
The Oklahoma Medical Examiner's Office added a total of four victims on Sunday to the list of the dead. Among those killed in the storms are four children and nine adults.
Medical Examiner's Office Amy Elliott spokeswoman didn't detail circumstances about how the victims died and didn't reply to messages. Names of the dead weren't released but three storm chasers were among those killed in a tornado that went through El Reno.
Searchers were still working Sunday to find seven missing people.