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 A series of explosions tore through the huge Phillips Petroleum Co. plastics plant near here,
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 injuring more than a hundred 
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and closing parts of the Houston Ship Channel.
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 There were no immediate reports of deaths, 
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but officials said 
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a number of workers were still unaccounted for last night.
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 The Bartlesville, Okla., oil company late yesterday still hadn't said officially 
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what caused the explosions and fires,
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 which sent columns of heavy black smoke billowing high into the air.
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 One local Phillips manager said 
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a seal blew in one of the plant's reactors.
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 Glenn Cox, Phillips' president and chief operating officer, and other Phillips officials flew from Bartlesville 
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to assess the damage
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 and determine the cause of the afternoon explosions.
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 In composite trading on the New York Stock Exchange, Phillips Petroleum shares fell $1.125 to $23.125. 
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 The plastics plant is located on an 800-acre tract in the heart of the petrochemical corridor 
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that reaches along the U.S. Gulf Coast.
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 The U.S. Coast Guard closed six miles of the Houston Ship Channel,
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 where about 150 companies have operations,
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 because the thick, black smoke obscured the area.
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 The Port of Houston closed its terminal
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 for handling bulk cargo.
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 Broken water lines and gas leaks hindered firefighters' efforts,
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 but by late yesterday authorities said 
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they had the fire under control.
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 The blasts blew out windows,
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 spewed debris for miles 
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and crumpled the ceiling in an area elementary school.
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 The initial fireball was caught by cameras in downtown Houston, about 10 miles away.
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 Nearby Pasadena, Texas, police reported 
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that 104 people had been taken to area hospitals, 
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but a spokeswoman 
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said that toll could rise.
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 The injured,
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 including three in critical condition,
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 were treated for burns, breathing problems and cuts from flying glass, 
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hospital officials said.
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 The plant employs between 800 and 900 on three shifts.
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 The number 
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working at the time of the blast
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 wasn't known.
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 Yesterday's explosions were the second round in two months at the plastics plant.
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 In late August, four contract workers were injured 
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and one Phillips employee died after an explosion at a fuel supply line near the facility's boiler house.
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 The Phillips facility manufactures polyethylene, polypropylene and K-resin, plastics
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 used in a wide array of applications, 
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including milk jugs and toys.
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 Plastics are the cornerstone of Phillips' chemicals operations, 
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which is the biggest single contributor to the company's profits.
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