A stubborn overnight fire in a pile of construction materials at an Irvine landscaping material company was caused by spontaneous combustion, authorities said Tuesday. The fire was reported at Tierra Verde Industries at 56 Fairbanks around 10:15 p.m. Monday, Orange County fire Authority Capt. Steve Concialdi said. It was extinguished hours later, before dawn. The 5,600-square-foot […]