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LIVERMORE – A spokesman for the California Department of Forestry reported that mutual aid helped extinguish a 549-acre grass fire before it threatened any structures near the Alameda/Contra Costa county line Monday. 

Capt. Joe Gonzalez said the fire, which occurred in an unincorporated area near Vasco Road, was reported at about 3:30 p.m. Monday and controlled by 6:30 p.m. 

Crews from the Alameda County Fire Department and the East Bay Regional Parks District, which supplied a helicopter and eight other pieces of equipment, assisted with the blaze. 

The cause is under investigation and there are no reported injuries, he said.