Published: Nov 08, 2010 9:48 PM EST
Updated: Nov 08, 2010 6:48 PM EST

RIVERSIDE, Calif. (AP) - Police have put up roadblocks and are using dogs to search a Southern California park for a big-rig trucker they suspect killed an officer during a chase.

Lt. Steve Johnson says the 200-acre Fairmount Park in Riverside will remain sealed off for several more hours Monday.

Police say Officer Ryan Bonaminio stopped a truck Sunday night after a report that it was involved in a hit-and-run accident.

Authorities say the trucker got out and ran into the park, where he and Bonaminio had a gunfight. Bonaminio was hit at least once and died at a hospital. The trucker drove off.

The search briefly delayed deliveries at a nearby Walmart distribution center but the general manager says all his trucks are accounted for and business is normal.