Local police say air quality has returned to safe levels after an ammonia gas leak in Oklahoma sent dozens of people to the hospital. This all started last night in Weatherford, Oklahoma, about 70 mi west of Oklahoma City. Authorities say a tanker truck was leaving, leaking rather, in a hotel parking lot, spewing gas, which triggered hundreds of evacuations.Let's bring in NBC News correspondent George Ciz. George, first, what more are we learning about how this incident unfolded and how disruptive was this ...