SUNOL (KPIX 5) – A small grass fire along southbound Interstate 680 near Sunol has led to a massive backup on the major East Bay highway early Monday morning.

According to officials, the fire broke out near Andrade Road, just past the I-680 / Highway 84 interchange around 5:30 a.m.

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The fire appeared to be out as of 6:50 a.m., but the right lane and shoulder remain blocked. Southbound I-680 is backed up through Pleasanton and to the Dublin interchange, while westbound Highway 84 is backed up to Vallecitos Road.

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Chopper 5 over a grass fire along Interstate 680 near Sunol on August 12, 2019. (CBS)

Chopper 5 over a grass fire along Interstate 680 near Sunol on August 12, 2019. (CBS)

Drivers are being asked to consider Interstate 580, Interstate 238 and Interstate 880 as alternate routes.

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It is unclear what caused the fire.