Tejeda said he watched four people being removed from the wreckage, and couldn't hear any yelling or sounds of panic.
First Class Tours, which operated the bus, said in a statement that the bus was carrying students home from Orlando, Florida, and the company is cooperating with investigators. He said he did not know how many passengers were injured, but said they were "numerous".
Baldwin County commissioner Christ Elliott said first responders "are having to rappel down" to access the crash site. That bus stopped after realizing what happened, but did not allow the students to get off, and eventually continued on to Channelview, a Houston suburb of about 38,000.
The bus pulled into Channelview High School east of Houston under police escort Tuesday afternoon.
Kramer said immediate details were limited and school authorities are in contact with law enforcement in Alabama to get more information.
Here are three things Federal Motor Carrier Safety Administration records revealed about the company. It was one of two buses transporting the students back to Texas.
The bus' front axle appeared separated from the vehicle and at least two doors to luggage compartments had been ripped off the side.
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