Mass Casualty Incidents | Slideshow

California Highway 99 Bus Crash

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California Bus Crash

Rescue crews work at the scene of a charter bus crash on northbound Highway 99 between Atwater and Livingston, Calif., Tuesday, Aug. 2, 2016. A charter bus veered off a central California freeway before dawn Tuesday and struck a pole that sliced the vehicle nearly in half. (Andrew Kuhn/Merced Sun-Star via AP)

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California Bus Crash

Authorities investigate the scene of a charter bus crash on northbound Highway 99 between Atwater and Livingston, Calif., Tuesday, Aug. 2, 2016. A charter bus veered off a central California freeway before dawn Tuesday and struck a pole that sliced the vehicle nearly in half, killing mulitple people and sending at least five others to hospitals, authorities said. (AP Photo/Scott Smith)

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California Bus Crash

Authorities investigate the scene of a charter bus crash on northbound Highway 99 between Atwater and Livingston, Calif., Tuesday, Aug. 2, 2016. A charter bus veered off a central California freeway before dawn Tuesday and struck a pole that sliced the vehicle nearly in half, killing multiple people and sending at least five others to hospitals, authorities said. (AP Photo/Scott Smith)

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California Bus Crash

The wreckage of a charter bus sits on northbound Highway 99 between Atwater and Livingston, Calif., Tuesday, Aug. 2, 2016. The bus veered off the central California freeway before dawn Tuesday and struck a pole that sliced the vehicle nearly in half, authorities said. (Andrew Kuhn/Merced Sun-Star via AP)

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APTOPIX California Bus Crash

Rescue crews respond to the scene of a charter bus crash on northbound Highway 99 between Atwater and Livingston, Calif., Tuesday, Aug. 2, 2016. The bus veered off the central California freeway before dawn Tuesday and struck a pole that sliced the vehicle nearly in half, authorities said. (Andrew Kuhn/Merced Sun-Star via AP)

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California Bus Crash

Rescue crews work at the scene of a charter bus crash on northbound Highway 99 between Atwater and Livingston, Calif., Tuesday, Aug. 2, 2016. The bus veered off the central California freeway before dawn Tuesday and struck a pole that sliced the vehicle nearly in half, authorities said. (Andrew Kuhn/Merced Sun-Star via AP)

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California Bus Crash

California Highway Patrol officers investigate the scene of a charter bus crash on northbound Highway 99 between Atwater and Livingston, Calif., Tuesday, Aug. 2, 2016. The bus veered off the central California freeway before dawn Tuesday and struck a pole that sliced the vehicle nearly in half, authorities said. (Andrew Kuhn/Merced Sun-Star via AP)

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California Bus Crash

Rescue crews respond to the scene of a charter bus crash on northbound Highway 99 between Atwater and Livingston, Calif., Tuesday, Aug. 2, 2016. A charter bus veered off a central California freeway before dawn Tuesday and struck a pole that sliced the vehicle nearly in half, authorities said. (Andrew Kuhn/Merced Sun-Star via AP)

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California Bus Crash

California Highway Patrol officers investigate the scene of a charter bus crash on northbound Highway 99 between Atwater and Livingston, Calif., Tuesday, Aug. 2, 2016. A charter bus veered off a central California freeway before dawn Tuesday and struck a pole that sliced the vehicle nearly in half, killing five people and sending at least five others to hospitals, authorities said. (AP Photo/Scott Smith)

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California Bus Crash

California Highway Patrol officers investigate the scene of a charter bus crash on northbound Highway 99 between Atwater and Livingston, Calif., Tuesday, Aug. 2, 2016. A charter bus veered off a central California freeway before dawn Tuesday and struck a pole that sliced the vehicle nearly in half, killing five people and sending at least five others to hospitals, authorities said. (AP Photo/Scott Smith)

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California Bus Crash

California Highway Patrol officers investigate the scene of a charter bus crash on northbound Highway 99 between Atwater and Livingston, Calif., Tuesday, Aug. 2, 2016. A charter bus veered off a central California freeway before dawn Tuesday and struck a pole that sliced the vehicle nearly in half, killing multiple people and sending at least five others to hospitals, authorities said. (AP Photo/Scott Smith)