Moreover, the defense ministry was also reportedly quoted as saying that no unsafe substances had been released into the atmosphere by the explosion of a liquid-propellant rocket engine in the Arkhangelsk region.
The area in Russia's northern Arkhangelsk region is home to a weapons testing range for the navy.
"Six representatives of the Defense Ministry and of the manufacturer have sustained injuries of varying severity at the scene", the defense ministry said.
Both were civilian specialists, the country's defence ministry said in a statement.
"There's no radioactive contamination", a spokeswoman for the Arkhangelsk region, where the base is situated, told AFP.
Citing data from the Emergencies Ministry, Greenpeace said radiation levels had risen 20 times above the normal level in the city, Reuters news agency reported.
The ministry also noted no risky substance was released into the atmosphere or to the region and the radiation levels are normal.
They added that the levels have since "normalized".
It was not clear exactly when the explosion occurred but the defence ministry made an official statement on the accident around 1 pm. Severodvinsk is the site of a shipyard that builds nuclear-powered submarines.
A series of blasts rocked an arms depot at a military base in Siberia on Monday, killing one, injuring 13 and prompting authorities to evacuate thousands of people from nearby settlements. The accident occurred in the town of Nyonoksa, about 25 miles from Severodvinsk, Interfax reported.
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