HOUSTON -- Two students are dead and at least three other people are seriously injured after a school bus rolled off a Houston freeway overpass.
A Houston Independent School District statement says a girl died at the scene Tuesday morning, and another student died at a hospital.
The district says two other students and the bus driver were also taken to hospitals with serious injuries.
Witnesses told CBS affiliate KHOU that the bus nose-dived and then fell onto its side along the freeway embankment.
The bus was bound for Furr High School, which also operates a charter school.
Names of the victims haven't been released.
Officials are investigating the cause of the crash. District spokeswoman Ashley Anthony says the bus apparently drove off an overpass. Guard rails were damaged. The bus rolled and landed on its side.
The accident is under investigation by the Houston Independent School District Police and the Houston Police Department, KHOU reported.
"We are deeply saddened by this tragedy and the loss of one of our students," said HISD Superintendent Terry Grier. "I ask all of the HISD community to join me in praying for all of those involved."
Houston operates the largest public school district in Texas with about 215,000 students.