Oklahoma Gov. Mary Fallin toured damage in El Reno, about 30 miles from Oklahoma City.
Tim Samaras, his son Paul Samaras and Carl Young were killed while chasing a tornado in El Reno.
Another person died at El Reno, and the circumstances involving the other two deaths weren't immediately known, Ms. Elliott said.
WSJ: Tornado-Hit Oklahoma Struck Again; Mother and Baby Dead
Mr. Laubach, who was chasing the El Reno tornado separately from the others, said he ultimately drove south to avoid it.
Friday night's victims included a mother and a baby sucked out of their car as the EF3 hit near El Reno.
Longtime storm chasers Tim Samaras, his son Paul and colleague Carl Young were killed Friday when a powerful tornado near El Reno, Okla.
Aerial images taken Saturday morning showed muddy water covering roadways around Oklahoma City and El Reno, about 30 miles west of Oklahoma City.
When the storm passed between El Reno and Yukon, it barreled down I-40 for more than two miles, ripping billboards down to twisted metal frames.
Dean and seven of his tourists found themselves near El Reno last week on the jam-packed roads when the deadly twisters began to drop from the sky.
El Reno Mayor Matt White didn't provide details about those killed after the tornado struck, but he stressed the importance of staying indoors when powerful storms hit.
Mr. Grzych and others said that while the Moore twister was more powerful, the characteristics of the El Reno tornado made it less predictable and more dangerous for chasers.
While the twisters damaged houses in Missouri and Illinois, the brunt of their force was reserved for Oklahoma City and its surrounding areas, including El Reno and Union City.
Police and firefighters were responding to reports of damage in El Reno, just outside Union City, but it was not immediately known how bad the damage was, Mayor Matt White said.
In Oklahoma, storm chasers with cameras in their cars transmitted video showing a number of funnels dropping from the supercell thunderstorm as it passed south of El Reno and into Oklahoma City just south of downtown.
WSJ: Tornado-Hit Oklahoma Struck Again; Mother and Baby Dead
At least nine people were killed in Friday's storms, including a mother and her baby sucked out of their car as a deadly twister tore its way along a packed Interstate 40 near the town of El Reno, about 30 miles from Oklahoma City.
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