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this is really special. captioning sponsored by cbs this is the "cbs evening news." >> axelrod: good evening. i'm jim axelrod. and this is our western addition of the broadcast. a curfew has now been declared in ferguson, missouri. it begins tonight at midnight central time, and will run until 5:00 sunday morning. missouri's governor jay nixon announced the implementation of the curfew late this afternoon after violence and looting returned to ferguson last night. 40 more f.b.i. ages have arrived in ferguson, according to the state police. they're working the neighborhood where a police officer shot and killed an unarmed teenager by the name of michael brown. in the hopes of finding more witnesses who can help clarify exactly what happened one week ago today. cbs news correspondent vladimir duthiers is on the ground in ferguson. >> good afternoon. >> reporter: the curfew, announced by governor jay nixon,