ABUJA, Oct. 23 (Xinhua) -- Nine people were killed in an accident early Tuesday in Nigeria's Lagos-Ibadan expressway, the busiest inter-state route in the country.

The local road safety police confirmed five others sustained serious injuries following the incident which involved a truck and a bus.

Clement Oladele, a commander of the Federal Road Safety Corps, told reporters that the accident was caused by speeding.

Oladele said the bus driver lost control and collided with the stationary truck on the 127-kilometer-long expressway.

The injured victims were taken to a nearby hospital for treatment, he said, adding the remains of the dead victims were also deposited at a government-owned morgue.

The Lagos-Ibadan expressway connecting Ibadan, the capital of Nigeria's southwestern state of Oyo and the commercial hub Lagos, is also the major route to the northern, southern and eastern parts of Nigeria.