WEATHERFORD, Okla. — A leaking tanker truck spewed dangerous ammonia gas outside a hotel overnight, filling its hallways with fumes and forcing hundreds of nearby residents of a small Oklahoma city to evacuate, authorities said Thursday. Several dozen people were treated at hospitals.

Officials lifted a shelter-in-place order Thursday morning, hours after firefighters wearing gas masks went door to door in Weatherford, waking people up and telling them to leave because of the anhydrous ammonia leak.

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