An eye-witness told the News Agency of Nigeria that the accident occurred around 1.30.p.m. opposite the Gbongan Community High School, Gbongan.
The witness said the accident involved a commercial bus marked XA 477 MAP and a truck marked XA 585 ALK which collided.
NAN learnt that the accident was caused by over-speeding by drivers of the two vehicles.
Mr Imoh Etuk, Sector Commander of the Osun State Command of the Federal Road Safety Commission confirmed the accident.
He said that preliminary investigation showed that the accident was caused by over-speeding by the drivers.
“People involved in the accident are 20. There were 12 females, five males, one male child and two female children.
“The total number of people who died is nine and these include six female adults, two male adults and a child,” he added.