NEW : All 21 wildfires are at least 50 % contained , Mark Stanford says . NEW : A fire in Midland is blamed on a vehicle tire that blew , he says . Officials are urging citizens to be very cautious with their outdoor activities on fire danger days . More than 136,000 acres have burned in 71 fires in Texas , the state forest service says . Comment:
NEW : All 21 wildfires are at least 50 % contained , Mark Stanford says . NEW : A fire in Midland is blamed on a vehicle tire that blew , he says . More than 136,000 acres have burned in 71 fires in Texas , the state forest service says . Comment: