DEVELOPING STORY: A school bus filled with students rolled over on a rural road Wednesday afternoon in Leander, Texas. There were 42 children on board along with an adult driver. At least two victims were airlifted to the hospital. First responders say there were 43 patients. At least 12 were transported to four area hospitals. One victim has life-threatening injuries. Two others have potentially life-threatening injuries. Children who did not require medical attention were taken to the Round Mountain Baptist Church to be reunified with their parents. Police say it’s unclear what caused the bus to leave the roadway and roll over. The bus was equipped with seatbelts. Watch video from the scene below and click here to get breaking news alerts delivered to your inbox.