The Webster Police chief said the two killed firefighters, including a volunteer officer who was also a police lieutenant, did not expect to be "shot and killed" in the line of duty.
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At least one person has died and 18 homes have been destroyed as wildfires rage through southern California.
Slightly cooler temperatures will replace the recent muggy weather while some areas will see heavy rain.
Andre Greipel won the final stage of the 2016 Tour de France as Chris Froome crossed the line arm-in-arm with his Team Sky team-mates