A tanker truck hauling flammable liquid has crashed on a Maryland highway and caught fire, killing the driver and damaging vehicles and homes. Authorities said fire crews arrived to find the truck completely engulfed in a fire that had spread to homes and vehicles. The blaze has since been extinguished. Authorities confirmed that the driver died but say no other fatalities or injuries were reported. Police say the cause of the crash is under investigation, as is the substance the truck was transporting. But officials say it's likely it was a commonly transported liquid like gasoline that poses no harm to the general public.