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The Russian-built, Soviet-era Antonov-12 cargo plane that crashed in South Sudan, killing at least 36 people, was in no condition to fly, the plane’s maker said.

The Antonov company, based in Ukraine, said the plane did not receive proper, timely maintenance and did not have “enough possibilities to perform flights.

” The company said the plane was registered to the Republic of Tajikistan.

Investigations are ongoing into the cause of the crash that killed at least 41 people.