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A three-alarm grassfire burned about 20 acres in Walnut Creek Tuesday, and was contained within an hour-and-a-half, said a Contra Costa County Fire Protection District official. 

No one was injured and no structures were threatened by the fire that was reported near Rock Spring Place and Walnut Boulevard, just outside the city limits at 4:49 p.m. The blaze was contained at 6:08 p.m.  

Contra Costa County fire crews received help from the California Department of Forestry and Fire Protection. 

The cause of the fire is under investigation.