UPDATE: Oceano Dunes vegetation fire burns 2 acres, forward progress stopped

UPDATE (3:30 p.m.) - CAL FIRE SLO says the fire burned 2.2 acres.

Fire crews will remain on scene for about another hour putting out small hot spots.

The cause is still under investigation.
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UPDATE (1:25 p.m.) - Forward progress of the vegetation fire has stopped, CAL FIRE SLO tweeted.

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UPDATE (12:55 p.m.) - The fire at the Oceano Dunes has burned about 4-5 acres and is at 60 percent containment, according to a tweet from CAL FIRE SLO.

Crews at the scene are making "good progress" on the fire.

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UPDATE (12:15 p.m.) - CAL FIRE SLO says the fire continues to spread slowly, according to a tweet. There are sufficient resources to fight the fire on scene.

It is not yet known what caused the fire.

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ORIGINAL STORY (12:02 p.m.) - CAL FIRE SLO and San Luis Obispo County Fire Department crews are responding to reports of a vegetation fire at Oceano Dunes at the Grand Avenue entrance at about 12 noon Sunday.

According to a tweet from CAL FIRE SLO, the vegetation fire is currently at one-quarter of an acre. The fire is reportedly spreading slowly.

Five Cities Fire Authority are helping crews on scene.

The fire was initially reported shortly before 12 noon.

This is a developing story. Please check back later for more updates.