HERRIMAN, Utah (AP) — Fire officials say a blaze started by machine-gun fire on a National Guard base could flare up and threaten a Salt Lake City suburb again. Unified Fire Authority chief Michael Jensen said Tuesday that about 400 firefighters and 120 National Guard members are bracing for hotter temperatures and 45 mph winds. The Utah National Guard has taken the blame for the fast-moving wildfire that destroyed three houses, damaged a fourth and is still has 450 homes evacuated. Utah Army National Guard Gen. Brian Tarbet has taken responsibility for a fire started by live-fire training Sunday despite high wind warnings at the base 30 miles south of Salt Lake City. Officials now say the fire has charred 4,300 acres, or nearly 7 square miles. It’s about 25 percent contained.