Firefighters are looking into what caused an approximate 8-acre brush fire to spark overnight in Reno.

It happened a little after midnight on West 4th Street near the Truckee River and Mayberry Drive.

Reno firefighters in an online Facebook post, say that no structures were threatened and the cause of the fire is still unknown at this time.  

No injuries have been reported.

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(Reno Firefighters Association contributed to this story.)