In this grab taken from a footage provided by the Russian State Atomic Energy Corporation ROSATOM press service, a Russian military band prepare to attend the funerals of five Russian nuclear engineers killed by a rocket explosion in Sarov, the closed city, located 370 kilometers (230 miles) east of Moscow, which has served as a base for Russia
In this grab taken from a footage provided by the Russian State Atomic Energy Corporation ROSATOM press service, a Russian military band prepare to attend the funerals of five Russian nuclear engineers killed by a rocket explosion in Sarov, the closed city, located 370 kilometers (230 miles) east of Moscow, which has served as a base for Russia's nuclear weapons program since the late 1940s, Russia, Monday, Aug. 12, 2019. Russia's Rosatom state nuclear concern said Thursday's explosion at a military testing range in northwestern Russia occurred while the engineers were testing a "nuclear isotope power source" for a rocket engine, a tragedy that fueled radiation fears and raised new questions about a secretive weapons program. (Russian State Atomic Energy Corporation ROSATOM via AP)
PHOTO: Russian State Atomic Energy Corporation/AP
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(CNN) —  

The Norwegian Radiation and Nuclear Safety Authority on Thursday said “tiny amounts of radioactive iodine” had been detected at an air-filter station, one week after a mystery-shrouded explosion at a Russian military test range.

“Tiny amounts of radioactive iodine [have] been measured in air at our air filter station in Svanhovd in Northern Norway,” the statement read.” The level detected is very low and poses no harm to people nor the environment.”

The statement added that the sample was taken during the period of 9-12 August.

It comes after a missile test went awry at a test range in northern Russia, killing at least five nuclear specialists on August 8.

Rosgidromet, the Russian meteorological agency, reported that radiation levels in the vicinity spiked four to 16 times higher than normal background levels.

The Norwegian agency had previously said there was “no health impact” after the brief radiation spike in Russia’s Arkhangelsk region.

“The measurement result is comparable to earlier measurements,” Thursday’s statement said.

“Norwegian monitoring stations detect radioactive iodine about 6-8 times a year and the source is usually unknown. When no other radioactive substances than iodine is detected, the source is most likely releases from production facilities for radioactive pharmaceuticals containing iodine.”

The statement added: “At present it is not possible to determine if the last iodine detection is linked to the accident in Arkhangelsk last week.”