A cargo plane has crashed on take-off near the international airport in South Sudan's capital Juba.

Two people were pulled from the wreckage alive but one of them later died, leaving a young boy as the only survivor, the Red Cross said.

The Antonov An-12 plane was heading to Paloch, Upper Nile State, and crashed 800m (half a mile) from the runway.

In a statement, Ukraine-based Antonov said the plane had not been airworthy.

It said the plane, which was built in 1971, "was is no state to fly because it failed to undergo timely technical servicing... that should have included work on extending its resources and exploitation timeframe", AFP news agency reported.

South Sudan authorities warned that the death toll could rise as the debris was cleared.

The plane crashed into a farming community on an island on the White Nile River but so far all the victims recovered were from the aircraft, the Red Cross said