FILE PHOTO: Russian President Vladimir Putin meets with FIFA President Gianni Infantino at the Kremlin in Moscow, Russia February 20, 2019. Yuri Kadobnov/Pool via REUTERS

MOSCOW (Reuters) - Russian authorities said on Friday that a doctor who treated those injured in a mysterious accident this month had the radioactive isotope Caesium-137 in his body, but said it was probably put there by his diet.

The deadly accident at a military site in northern Russia took place on Aug. 8 and caused a brief spurt of radiation. Russian President Vladimir Putin later said it occurred during testing of what he called promising new weapons systems.

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(Reuters/Tatyana Makeyeva)

OSLO (Reuters) - An explosion that killed five Russian scientists during a rocket engine test this month was followed by a second blast two hours later, the likely source of a spike in radiation, Norway's nuclear test-ban monitor said on Friday.

The second explosion was likely from an airborne rocket powered by radioactive fuel, the Norsar agency said - though the governor of Russia's Arkhangelsk region, where the blast took place, dismissed reports of another blast.

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