Mass Casualty Incidents | Slideshow

Over 30 Injured in Houston Bus Crash

01 / 04

APTOPIX Bus Crash Houston

A Metro operator who was riding as a passenger on a Metro bus involved in a crash is removed by emergency workers, Wednesday, June 1, 2016, in Houston. A Houston transit bus hit a pickup truck and slammed into an overhead highway sign, injuring dozens of people. (Mark Mulligan/Houston Chronicle via AP) MANDATORY CREDIT

02 / 04

Bus Crash Houston

A person walks by after a Metro bus crashed into the sign Wednesday, June 1, 2016, in Houston. A Houston transit bus hit a pickup truck and slammed into an overhead highway sign, injuring dozens of people. (Mark Mulligan/Houston Chronicle via AP) MANDATORY CREDIT

03 / 04

Bus Crash Houston

Firefighters assess riders of a Metro bus after a crash Wednesday, June 1, 2016, in Houston. A Houston transit bus hit a pickup truck and slammed into an overhead highway sign, injuring dozens of people. (Mark Mulligan/Houston Chronicle via AP) MANDATORY CREDIT

04 / 04

Bus Crash Houston

A Metro operator who was riding as a passenger on a Metro bus involved in an crash is removed by emergency workers, Wednesday, June 1, 2016, in Houston. A Houston transit bus hit a pickup truck and slammed into an overhead highway sign, injuring dozens of people. (Mark Mulligan/Houston Chronicle via AP) MANDATORY CREDIT