HOUSTON -- An ambulance responded to a crash involving a Clear Creek ISD school bus early Wednesday.

Views from Air 11 showed the bus collided with a sedan on El Dorado near El Camino Road. The crash happened shortly before 9:30 a.m.

The school district said about 40 students were onboard at the time. Four were taken to the hospital by ambulance to checked out. The rest of the students went on to school at Clear Lake High School.

The cause of the crash is under investigation.