MOSCOW: A Russian military plane crashed in annexed Crimea, killing six crew and 23 passengers on board, Russian news agencies reported in the early hours of Wednesday, citing the country's Defence Ministry.

The An-26 military transport plane was carrying out a scheduled flight over the Crimean peninsula, which Russia illegally annexed from Ukraine in 2014, the reports said. The military lost contact with the plane around 6 pm on Tuesday.

Russian news agency Interfax quoted the Defence Ministry as saying that they believe the crash was caused by a technical malfunction and that there was no “damaging interference” with the plane.

The plane crashed into a cliff, sources at the site of the crash told state news agencies Tass and RIA Novosti.

The An-26 is a Soviet-designed military transport turboprop aircraft.