( CNN ) -- One person was killed and another injured in a chemical plant explosion late Thursday near Charleston , West Virginia . Sterling Lewis Jr. , West Virginia 's fire marshal , told reporters Friday morning that a helicopter took the injured person to a burn unit in Pittsburgh , Pennsylvania . Several thousand people were ordered to stay indoors for safety early Friday after the 10:30 p.m. Thursday blast at the Bayer CropScience plant raised fears about air quality . The plant produces crop-protection chemicals in Institute , an unincorporated community in Kanawha County , West Virginia . Jeannie Young , 38 , turned off air conditioners , closed vents and taped windows shut at her St. Albans home after the nearby explosion . `` My daughter and I have headaches , '' Young said . She said she smelled something unusual and noticed something odd after taking her three dogs out around 11 p.m. Thursday . `` They acted really funny , '' she said . `` They wanted to come right back in the house . '' Watch how the plant blast puts a scare into West Virginians » . Young endured a few hours of anxiety with her 15-year-old daughter , Brittney , as authorities closed parts of Interstate 64 and fought a blaze at the plant . `` It was , like , really scary at first , '' Brittney said . Emergency officials in Kanawha County ordered people to stay inside in the cities of South Charleston , Cross Lane , Dunbar and St. Albans , where the Youngs live about four miles from the plant . iReport.com : Where you there ? Share your story . Authorities lifted the order about 2:15 a.m. after the Bayer CropScience plant told the county that the explosion did not send contaminants into the air , said Carolyn Charnoch , director of the 911 system in Kanawha County . The blast sent flames leaping into the night sky , casting an orange glow on industrial towers , but firefighters had extinguished the blaze by about 2 a.m. , she said . A few people complained of a foul odor , she said , but authorities had not heard from anyone complaining of health problems related to air quality , Charnoch said . Mike Dorsey of the West Virginia Department of Environmental Protection sought to reassure people that the air was safe to breath . The plant contains potentially dangerous chemicals , he said , but the explosion did not release them into the air . `` People should not be concerned about coming outside , '' he said . CNN 's Greg Morrison , Lateef Mungin and Mark Bixler contributed to this report .
July : Blast at Bayer AG plant kills one person , wounds another . Police extinguish fire about two hours after blast . People asked to stay indoors after explosion raised concerns about air quality . Plant produces crop - protection chemicals .