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)
Four people are dead and dozens others are injured in a crash between a bus and a Duck vehicle. Read more here.
A victim from a fatal crash involving a "Ride the Ducks" amphibious tour bus and a charter bus is loaded into an ambulance, Thursday, Sept. 24, 2015, in Seattle. (AP Photo/Ted S. Warren)
Four people are dead and dozens others are injured in a crash between a bus and a Duck vehicle. Read more here.
The ticket booths are closed and shades drawn at the company offices of "Ride the Ducks" after one of their amphibious, military-style tour vehicles was involved in a deadly crash Thursday, Sept. 24, 2015, in Seattle. Several vehicles collided on the busy Aurora Bridge, Thurday. (AP Photo/Elaine Thompson)
A charter bus at left and a "Ride the Ducks" amphibious tour bus, center, remain on the scene following a fatal crash, Thursday, Sept. 24, 2015, in Seattle. (AP Photo/Ted S. Warren)
The ticket booths are closed and the parking lot empty at the company offices of "Ride the Ducks" after one of their amphibious, military-style tour vehicles was involved in a deadly crash Thursday, Sept. 24, 2015, in Seattle. Several vehicles collided on the busy Aurora Bridge, Thursday. (AP Photo/Elaine Thompson)
A Ride the Ducks vehicle has crashed with a charter bus on Seattle's Aurora Bridge. Read more here.
Four people are dead and dozens others are injured in a crash between a bus and a Duck vehicle. Read more here.
People with bandaged arms stand next to a bus that was involved in the fatal crash with a Ride the Ducks tour bus and several other vehicles, Thursday, Sept. 24, 2015 in Seattle. (AP Photo/Ted S. Warren)
Four people are dead and dozens others are injured in a crash between a bus and a Duck vehicle. Read more here.
An emergency worker walks in front of a charter bus that was involved in a fatal crash with a "Ride the Ducks" amphibious tour bus, Thursday, Sept. 24, 2015, in Seattle. (AP Photo/Ted S. Warren)
Emergency personnel work at the scene of a fatal collision involving a charter bus and a "Ride the Ducks" amphibious tour bus on the Aurora Bridge in Seattle on Thursday, Sept. 24, 2015. (AP Photo/Ted S. Warren)
Four people are dead and dozens others are injured in a crash between a bus and a Duck vehicle. Read more here.
A victim from a fatal crash involving a "Ride the Ducks" amphibious tour bus and a charter bus is loaded into an ambulance, Thursday, Sept. 24, 2015, in Seattle. (AP Photo/Ted S. Warren)
Victims, right, and second from left, are taken from the scene of a fatal crash involving a "Ride the Ducks" amphibious tour bus, and charter bus, Thursday, Sept. 24, 2015, in Seattle. (AP Photo/Ted S. Warren)
A Seattle Police Dept. official stands in a bus involved in a crash with a "Ride the Ducks" amphibious, military-style tour bus as a worker from the King County Medical Examiner's office lloks on as the scene is investigated Thursday, Sept. 24, 2015, in Seattle. (AP Photo/Ted S. Warren) Click here for updates.
Multiple people have died; others are critically hurt in a crash between a Ride the Ducks vehicle and a bus. Read more here.
Four people are dead and dozens others are injured in a crash between a bus and a Duck vehicle. Read more here.
A Ride the Ducks vehicle has crashed with a charter bus on Seattle's Aurora Bridge. Read more here.
Four people are dead and dozens others are injured in a crash between a bus and a Duck vehicle. Read more here.
A victim from a crash involving a Ride the Ducks tour bus and several other vehicles is loaded into an ambulance, Thursday, Sept. 24, 2015 in Seattle. (AP Photo/Ted S. Warren)
Emergency personnel work at the scene of a fatal collision involving a charter bus and a "Ride the Ducks" amphibious tour bus on the Aurora Bridge in Seattle on Thursday, Sept. 24, 2015. (AP Photo/Ted S. Warren)
Multiple people have died; others are critically hurt in a crash between a Ride the Ducks vehicle and a bus. Read more here.
Four people are dead and dozens others are injured in a crash between a bus and a Duck vehicle. Read more here.
