Harare  - Initial investigations into the crash which killed Zimbabwean Prime Minister Morgan Tsvangirai's wife suggest that the truck which collided with their car belonged to a US aid organisation, according to media reports in South Africa.

The driver of the truck has been arrested, according to the reports, whilst President Robert Mugabe has attempted to contact the US ambassador regarding the collision between the truck and the prime minister's Sports Utility Vehicle (SUV).

Tsvangirai survived the crash on Friday afternoon with only minor injuries, but his wife of 31 years, Susan, was killed.

Early reports suggested that Tsvangirai's SUV received a glancing blow from an oncoming truck, which sent it spinning off the road and overturning.

According to the same media reports, Tsvangirai - the prime minister for just over three weeks in an uneasy power-sharing coalition government with longtime foe Mugabe
- may be transferred to a South African specialist clinic.

Mugabe visited Tsvangirai in hospital on Friday night.

The crash happened on the road near Beatrice, about 60 kilometres south of the capital, Harare.

Zimbabwe is in the grip of its most severe crisis in recent times, with hyperinflation, mass poverty and hunger, and a cholera outbreak which has killed around 4,000 people. (dpa)