UPDATE 11:18 a.m.: Washoe County Sheriff's Office reported that there was a body found within the burnt vehicle on I-580. An active investigation is ongoing.
The circumstances were deemed to be suspicious, but WCSO Public Information Officer Sarah Johns could not confirm any additional details.
According to NHP Trooper Charles Caster, fire marshals were called early this morning to investigate an active vehicle fire.
As of 11:20 a.m., one lane is open on I-580 after a brief closure of all lanes, but lengthy delays are expected.
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I-580 southbound lanes south of Mount Rose between Reno and Carson City has been narrowed to one lane, according to Nevada State Police.
The SR-431 on-ramp is closed. Motorists should use an alternate route as it is unknown when the road will fully reopen.