Disaster_Accident

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Colorado Avalanche defenseman Erik Johnson (6) goes down after checking Florida Panthers center Jonathan Huberdeau (11) during the second period of an NHL hockey game in Sunrise, Fla., Friday, Jan. 24, 2014. (AP Photo/Alan Diaz)

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Florida Panthers goalie Tim Thomas (34) blocks a shot by Colorado Avalanche center Ryan O'Reilly (90) during the first period of an NHL hockey game in Sunrise, Fla., Friday, Jan. 24, 2014. (AP Photo/Alan Diaz)

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Colorado Avalanche center Paul Stastny (26) scores a goal against Florida Panthers goalie Tim Thomas (34) during the first period of an NHL hockey game in Sunrise, Fla., Friday, Jan. 24, 2014. (AP Photo/Alan Diaz)

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Colorado Avalanche left wing Jamie McGinn (11) is congratulated by teammate Matt Duchene (9) after McGinn scored against the Florida Panthers during the second period of an NHL hockey game in Sunrise, Fla., Friday, Jan. 24, 2014. (AP Photo/Alan Diaz)

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Alice Greenwald, director of the National Sept. 11 Memorial Museum, left, listens as Joseph Daniels, president of the National Sept. 11 Memorial, speak during a press conference on Friday Jan. 24, 2014 in New York. After years of delays due to funding disputes, engineering challenges and a nearly disastrous flood, the museum will open to the public in mid-May in a giant cavern beneath the World Trade Center site — with a world-class admissions price of $24. (AP Photo/Bebeto Matthews)

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Railroad crews work on one of five derailed tank cars on a bridge over the Schuylkill River, Friday, Jan. 24, 2014, in Philadelphia. The accident Monday follows a series of derailments involving Bakken Shale crude from North Dakota including one that exploded in Canada, killing 47 people. (AP Photo/Matt Rourke)

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Railroad crews work on one of five derailed tank cars on a bridge over the Schuylkill River, Friday, Jan. 24, 2014, in Philadelphia. The accident Monday follows a series of derailments involving Bakken Shale crude from North Dakota including one that exploded in Canada, killing 47 people. (AP Photo/Matt Rourke)

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Railroad crews work on one of five derailed tank cars on a bridge over the Schuylkill River, Friday, Jan. 24, 2014, in Philadelphia. The accident Monday follows a series of derailments involving Bakken Shale crude from North Dakota including one that exploded in Canada, killing 47 people. (AP Photo/Matt Rourke)