According to Southern African based, News24,
Police spokesperson Leonard Hlathi said the tourists were travelling on a bus converted from a truck and were due to leave South Africa on Thursday after an earlier trip to neighboring Swaziland.
"There were 22 tourists on the bus. All of them were UK citizens except the driver who is Zimbabwean," Hlathi said.
Hlathi said two who were killed were women. He said observations and records found at the scene, showed it was likely the tourists were school children on a school tour.
from the host nation of the 2010 FIFA World Cup said it is understood the bus driver lost control of the vehicle returning from Swaziland, causing it to overturn.
It said at the time of reporting, the British high commissioner to South Africa was leading a crisis team to the the scene of the crash in the provincial capital, Nelspruit.