(CNN) Russian President Vladimir Putin has said that there's no risk of increased radiation levels following a deadly blast at a military site in Northern Russia earlier this month that killed at least five people.

"There is no threat here, no increase in the [radiation] background exists either," Putin said during a visit to France on Monday.

"We don't see any serious changes there, but preventive measures are being taken so there are no surprises," Putin continued, adding that independent experts were sent to the site to monitor the situation.

The explosion took place during a test of a liquid propulsion system at a military training ground in Russia's northern Arkhangelsk region, about 30 kilometers from the city of Severodvinsk.

While the Russian military told state news agencies on the day of the blast that radiation levels in the vicinity were normal, Rosgidromet -- a Russian meteorological agency -- warned that it had recorded radiation levels four to 16 times higher than normal.

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