At least seven persons were injured, none seriously, when a tornado touched down near Ft. Rucker, Ala., state troopers reported. All were treated and re-| leased at a local hospital. In Ozark, Ala., a twister destroyed four mobile homes and damaged another, but no one was hurt. There were reports also of property damage, power lines down and uprooted trees. An Alabama state trooper said 15 duplexes near Ft. Rucker were destroyed or heavily damaged.