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Fatal Houston School Bus Crash

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Houston School Bus Wreck

An overturned Houston school bus is prepared for towing after it drove off a highway overpass Tuesday, Sept. 15, 2015, in Houston. A female student died at the scene of the wreck and a second girl died at a hospital, according to a statement by the Houston Independent School District. Three others seriously injured (AP Photo/Pat Sullivan)

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Houston School Bus Wreck

Investigators work around a Houston school bus, right, after it drove off a highway overpass Tuesday, Sept. 15, 2015, in Houston. A female student died at the scene of the wreck and a second girl died at a hospital, according to a statement by the Houston Independent School District. Three others seriously injured (AP Photo/Pat Sullivan)

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Houston School Bus Wreck

Investigators work around a Houston school bus after it drove off a highway overpass Tuesday, Sept. 15, 2015, in Houston. A female student died at the scene of the wreck and a second girl died at a hospital, according to a statement by the Houston Independent School District. Three others seriously injured (AP Photo/Pat Sullivan)

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Houston-School Bus Wreck

An emergency personnel looks inside a school bus after the bus went off a Houston freeway and rolled in southeast Houston on Tuesday, Sept. 15, 2015. The Houston Independent School District says a girl died in Tuesday morning’s accident. Emergency responders say the student was dead at the scene. Officials are trying to determine what caused the crash. A district spokeswoman says it appears the bus went off an overpass. (Cody Duty/Houston Chronicle via AP) MANDATORY CREDIT

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APTOPIX Houston School Bus Wreck

Investigators work around a Houston school bus, left, after it drove off a highway overpass, Tuesday, Sept. 15, 2015, in Houston, killing two students and seriously injuring three other people, police and school officials said. (AP Photo/Pat Sullivan)

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Houston School Bus Wreck

An investigator photographs the front of a Houston school bus after it drove off a highway overpass Tuesday, Sept. 15, 2015, in Houston. A female student died at the scene of the wreck and a second girl died at a hospital, according to a statement by the Houston Independent School District. Three others seriously injured (AP Photo/Pat Sullivan)

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Houston School Bus Wreck

Highway workers look over the broken guard rail where a Houston school bus, right, drove off and flipped Tuesday, Sept. 15, 2015, in Houston. A female student died at the scene of the wreck and a second girl died at a hospital, according to a statement by the Houston Independent School District. Three others seriously injured (AP Photo/Pat Sullivan)

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Houston-School Bus Wreck

Merida Miller and her two children, Sonny, left, and Krystina pray at a makeshift memorial, Tuesday, Sept. 15, 2015, in Houston. Miller said he she heard the news of the bus crash it might have been her daughter's school bus. A school bus plunged off a highway overpass after being hit by a car on Tuesday, killing two students and seriously injuring three other people, police and school officials said. (Steve Gonzales/Houston Chronicle via AP) MANDATORY CREDIT