Two pilots are dead after the air tankers they were flying collided while fighting Nevada's Bishop Fire Thursday. They were the only people aboard the single-engine planes, which were based out of Utah and were being used in an attempt to bring the wildfire under control, News 3 Las Vegas reports. "We offer our sincere condolences to the families of the two pilots and to all those working with the BLM Nevada Ely District," a Bureau of Land Management spokesperson says. The incident is under investigation. The 14,000-acre fire started Wednesday and was caused by human action, per KOAA; it is not expected to be contained until August 5, CNN reports. (More Nevada stories.)