A tanker carrying diesel has killed a pregnant woman and her two children at the Ikare area of Ondo State.
Many others, mostly motorcyclists were also said to have been killed and others badly injured.
The incident was said to have happened when an accident involving a diesel tanker, truck and six motor-cycles occurred.
Many people were reportedly injured as the truck carrying petroleum content crashed at a commercial area of Okorun quarter, killing the deceased while many were injured.
Sources disclosed that the trailer conveying diesel had a break failure and crashed into a truck which eventually crushed the commercial motor-cyclists.
According to them, the truck was coming from Ado Ekiti axis of Ikare-Ado road when it lost control and crashed to the commercial area opposite a police station at Okorun Ikare.
Eyewitnesses disclosed that the number of deaths have risen to eight, however, Spokesman for the Federal Road Safety Corps (FRSC) in the state, Omotola Ogungbawo, confirmed only four deaths.
Officials of the FRSC said that the accident involved two trucks, four motorcycles and six other vehicles.
Mothers of those injured have since been conveyed to the hospital.