Mass Casualty Incidents | News | Rescue & Vehicle Extrication | Slideshow

Bus and Tour Vehicle Crash in Seattle

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Seattle Tour Bus Crash

Emergency personnel work at the scene of a fatal collision involving a charter bus, background, and a "Ride the Ducks" amphibious tour bus, right, on the Aurora Bridge in Seattle on Thursday, Sept. 24, 2015. (Joshua Trujillo/seattlepi.com via AP) NO SALES; MAGS OUT; SEATTLE OUT; SEATTLE ONLINE OUT; SEATTLE TV ONLINE OUT; SEATTLE RADIO ONLINE OUT; SEATTLE TIMES OUT; KING OUT; KOMO OUT; KIRO TV OUT; KIRO RADIO OUT; MANDATORY CREDIT: JOSHUA TRUJILLO/SEATTLEPI.COM

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Seattle Tour Bus Crash

Emergency vehicles surround the site of a deadly crash between a charter bus and an amphibious tour vehicle in Seattle on Thursday, Sept. 24, 2015. Seattle fire officials say two people have been killed and numerous others critically injured in the crash that happened on a bridge over Lake Union. (AP Photo/Elaine Thompson)

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Seattle Tour Bus Crash

Emergency personnel work at the scene of a fatal collision involving a charter bus, background, and a "Ride the Ducks" amphibious tour bus, right, on the Aurora Bridge in Seattle on Thursday, Sept. 24, 2015. (Greg Gilbert/The Seattle Times via AP)

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Seattle Tour Bus Crash

A charter bus, left, and an amphibious, military-style tour vehicle remain on the Aurora Bridge after colliding in a deadly crash involving several vehicles Thursday, Sept. 24, 2015, in Seattle. (AP Photo/Elaine Thompson)

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Seattle Tour Bus Crash

A charter bus, left, and an amphibious tour vehicle remain on the Aurora Bridge after colliding in a deadly crash involving several vehicles Thursday, Sept. 24, 2015, in Seattle. (AP Photo/Elaine Thompson)

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Seattle Tour Bus Crash

A charter bus, left, and an amphibious, military-style tour vehicle remain on the Aurora Bridge after colliding in a deadly crash involving several vehicles Thursday, Sept. 24, 2015, in Seattle. (AP Photo/Elaine Thompson)

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APTOPIX Seattle Tour Bus Crash

Emergency personnel work at the scene of a fatal collision involving a charter bus, background, and a "Ride the Ducks" amphibious tour bus, right, on the Aurora Bridge in Seattle on Thursday, Sept. 24, 2015. (Joshua Trujillo/seattlepi.com via AP) NO SALES; MAGS OUT; SEATTLE OUT; SEATTLE ONLINE OUT; SEATTLE TV ONLINE OUT; SEATTLE RADIO ONLINE OUT; SEATTLE TIMES OUT; KING OUT; KOMO OUT; KIRO TV OUT; KIRO RADIO OUT; MANDATORY CREDIT: JOSHUA TRUJILLO/SEATTLEPI.COM

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Seattle Tour Bus Crash

A Ride the Ducks tour bus that was involved in a crash with several other vehicles can be seen behind an ambulance as officials respond, Thursday, Sept. 24, 2015 in Seattle. Seattle fire officials say two people have been killed and numerous others critically injured in the crash that happened on a bridge over Lake Union. (AP Photo/Ted S. Warren)

09 / 14

Seattle Tour Bus Crash

People with bandaged arms stand next to a bus that was involved in the crash with a Ride the Ducks tour bus and several other vehicles, Thursday, Sept. 24, 2015 in Seattle. Seattle fire officials say two people have been killed and numerous others critically injured in the crash that happened on a bridge over Lake Union. (AP Photo/Ted S. Warren)

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Seattle Tour Bus Crash

People with bandaged arms stand next to a bus that was involved in the crash with a Ride the Ducks tour bus and several other vehicles, Thursday, Sept. 24, 2015 in Seattle. Seattle fire officials say two people have been killed and numerous others critically injured in the crash that happened on a bridge over Lake Union. (AP Photo/Ted S. Warren)

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Seattle Tour Bus Crash

Emergency vehicles surround the site of a deadly crash between a charter bus and an amphibious tour vehicle in Seattle on Thursday, Sept. 24, 2015. Seattle fire officials say two people have been killed and numerous others critically injured in the crash that happened on a bridge over Lake Union. (AP Photo/Elaine Thompson)

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CORRECTION Seattle Tour Bus Crash

REMOVES POOL DESIGNATION - A victim from a crash involving a charter bus and amphibious tour vehicle is loaded into an ambulance, Thursday, Sept. 24, 2015 in Seattle. Seattle fire officials say two people have been killed and numerous others critically injured in the crash that happened on a bridge over Lake Union. (AP Photo/Ted S. Warren)

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APTOPIX Seattle Tour Bus Crash

Emergency personnel respond at the scene of a crash involving a charter bus and amphibious tour vehicle Thursday, Sept. 24, 2015 in Seattle. Seattle fire officials say two people have been killed and numerous others critically injured in the crash that happened on a bridge over Lake Union. (AP Photo/Ted S. Warren)

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Seattle Tour Bus Crash

Emergency vehicles surround the site of a deadly crash between a charter bus and an amphibious tour vehicle in Seattle on Thursday, Sept. 24, 2015. Seattle fire officials say two people have been killed and numerous others critically injured in the crash that happened on a bridge over Lake Union. (AP Photo/Elaine Thompson)