The leader of an association of Ugandans working in South Sudan says at least 35 people were killed when a bus collided with a truck on a highway linking South Sudan to Uganda.

John Nsubuga said Monday that the accident happened at Nisitu, some 10 kilometers (6 miles) south of Juba, South Sudan's capital, as the bus sped to cross a bridge before a truck arrived from the opposite direction.

The bus crashed into the truck, killing or wounding most of the passengers, he said by phone from the Juba Teaching Hospital mortuary, where bodies were being identified.

He said the bus, which was headed to Uganda, had at least 60 passengers, and most of the victims bled to death.

He said most of the victims are Ugandans.