The Australian Space Agency has revealed that the mysterious light streak witnessed across Victoria's night sky shortly after Monday midnight likely originated from the remnants of a Russian rocket.

Watch: Mysterious light seen above Australia's Victoria linked to Russian rocket

Russia's state nuclear agency Rosatom said early on Saturday that five of its staff members had been killed in an accident during tests on a military site in northern Russia, the RIA news agency reported.

Russia says five killed in mysterious rocket test accident: Report

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Watch: Mysterious light seen above Australia's Victoria linked to Russian rocket

Russia says five killed in mysterious rocket test accident: Report