Disaster_Accident

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Air Force Security officers patrol the area near the location where a military aircraft crashed, Wednesday, April 5, 2017, in Clinton, Md. The Air Force said that the pilot was on a training mission in an F-16 from the Andrews Air Force-based 113th Wing. Officials say the pilot ejected and is safe. The plane went down a few miles from Andrews. (AP Photo/Pablo Martinez Monsivais)

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This Monday, April 3, 2017 photo from video by KMOV shows damage to the roof of a laundry business in St. Louis after a boiler exploded at a nearby box company and flew before crashing through the roof. Authorities said several people were killed as a result of the explosion. (KMOV via AP)

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Fans leave Augusta National as a weather warning is posted during a practice round for the Masters golf tournament Wednesday, April 5, 2017, in Augusta, Ga. (AP Photo/Chris Carlson)

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Fans leave Augusta National as a weather warning is posted during a practice round for the Masters golf tournament Wednesday, April 5, 2017, in Augusta, Ga. (AP Photo/Chris Carlson)

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Fans leave Augusta national for a weather warning during a practice round for the Masters golf tournament Wednesday, April 5, 2017, in Augusta, Ga. (AP Photo/Charlie Riedel)

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Fans leave Augusta National as play is suspended for a weather warning during a practice round for the Masters golf tournament Wednesday, April 5, 2017, in Augusta, Ga. (AP Photo/David Goldman)

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Fans leave Augusta National for a weather warning during a practice round for the Masters golf tournament Wednesday, April 5, 2017, in Augusta, Ga. (AP Photo/Chris Carlson)

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Air Force Security officers secure the area near the location where a military aircraft crashed, Wednesday, April 5, 2017, in Clinton, Md. The Air Force said that the pilot was on a training mission in an F-16 from the Andrews Air Force-based 113th Wing. Officials say the pilot ejected and is safe. The plane went down a few miles from Andrews. (AP Photo/Pablo Martinez Monsivais)

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Law enforcement officer secure the area near the location where a military aircraft crashed, Wednesday, April 5, 2017, in Clinton, Md. The Air Force said that the pilot was on a training mission in an F-16 from the Andrews Air Force-based 113th Wing. Officials say the pilot ejected and is safe. The plane went down a few miles from Andrews. (AP Photo/Pablo Martinez Monsivais)

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FILE - In this April 30, 2014, file photo firefighters and rescue personnel work along the tracks where several CSX tanker cars carrying crude oil derailed and caught fire along the James River in Lynchburg, Va. Inspectors have found almost 24,000 safety defects over a two-year period along United States railroad routes used to ship volatile crude oil. Data obtained by The Associated Press shows many of the defects were similar to problems blamed in past derailments that caused massive fires or oil spills in Oregon, Virginia and Montana. (Autumn Parry/News & Daily Advance via AP)

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FILE - This Nov. 6, 2013 file photo shows a warning placard on a tank car carrying crude oil near a loading terminal in Trenton, N.D. Inspectors have found almost 24,000 safety defects over a two-year period along United States railroad routes used to ship volatile crude oil. Data obtained by The Associated Press shows many of the defects were similar to problems blamed in past derailments that caused massive fires or oil spills in Oregon, Virginia and Montana. (AP Photo/Matthew Brown, File)

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FILE - In this June 3, 2016, file image made from a video provided by KGW-TV, smoke billows from a Union Pacific train that derailed near Mosier, Ore., in the scenic Columbia River Gorge. Inspectors have found almost 24,000 safety defects over a two-year period along United States railroad routes used to ship volatile crude oil. Data obtained by The Associated Press shows many of the defects were similar to problems blamed in past derailments that caused massive fires or oil spills in Oregon, Virginia and Montana. (KGW-TV via AP, File)

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FILE - In this May 1, 2014, file photo survey crews in boats look over tanker cars as workers remove damaged tanker cars along the tracks where several CSX tanker cars carrying crude oil derailed and caught fire along the James River near downtown Lynchburg, Va. Inspectors have found almost 24,000 safety defects over a two-year period along United States railroad routes used to ship volatile crude oil. Data obtained by The Associated Press shows many of the defects were similar to problems blamed in past derailments that caused massive fires or oil spills in Oregon, Virginia and Montana. (AP Photo/Steve Helber, File)

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Colorado Avalanche defenseman Erik Johnson, right, celebrates scoring the game-winning goal with left wing J.T. Compher in overtime of an NHL hockey game against the Chicago Blackhawks late Tuesday, April 4, 2017, in Denver. The Avalanche won 4-3 in overtime. (AP Photo/David Zalubowski)

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Carolina Hurricanes' Bryan Bickell warms up before the team's NHL hockey game against the Minnesota Wild on Tuesday, April 4, 2017, in St. Paul, Minn. Bickell has rejoined the Hurricanes for the last few games of the regular season, five months after his diagnosis of multiple sclerosis forced a hiatus from the team and raised questions about his future in the sport. (AP Photo/Jim Mone)

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Carolina Hurricanes' Bryan Bickell takes a short break before the team's NHL hockey game against the Minnesota Wild on Tuesday, April 4, 2017, in St. Paul, Minn. Bickell has rejoined the Hurricanes for the last few games of the regular season, five months after his diagnosis of multiple sclerosis forced a hiatus from the team and raised questions about his future in the sport. (AP Photo/Jim Mone)

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Carolina Hurricanes' Bryan Bickell, left, and Minnesota Wild's Matt Dumba collide in the first period of an NHL hockey game Tuesday, April 4, 2017, in St. Paul, Minn. Bickell has rejoined the Hurricanes for the last few games of the regular season, five months after his diagnosis of multiple sclerosis forced a hiatus from the team and raised questions about his future in the sport. (AP Photo/Jim Mone)

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Carolina Hurricanes' Bryan Bickell, left, maintains his footing as he and Minnesota Wild's Matt Dumba collide in the first period of an NHL hockey game Tuesday, April 4, 2017, in St. Paul, Minn. Bickell has rejoined the Hurricanes for the last few games of the regular season, five months after his diagnosis of multiple sclerosis forced a hiatus from the team and raised questions about his future in the sport. (AP Photo/Jim Mone)

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Carolina Hurricanes' Bryan Bickell takes a shift in the first period of an NHL hockey game against the Minnesota Wild Tuesday, April 4, 2017, in St. Paul, Minn. Bickell has rejoined the Hurricanes for the last few games of the regular season, five months after his diagnosis of multiple sclerosis forced a hiatus from the team and raised questions about his future in the sport. (AP Photo/Jim Mone)

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Chicago Blackhawks left wing Artemi Panarin, left, of Russia, uses his stick to slow down Colorado Avalanche center Nathan MacKinnon as he drives down the ice in the first period of an NHL hockey game Tuesday, April 4, 2017, in Denver. (AP Photo/David Zalubowski)