Two people in Russian Federation were killed after an explosion at a military base used for missile tests in the far north of the country, the defence ministry said in a statement to news agencies. In addition to the two deaths, it said six people were injured in the blast.
As per the city administration, radiation level rose to 2 microsieverts per hour for about 30 minutes before it returned to its natural level of 0.1 microsieverts per hour.
The rocket engine explosion occurred at a weapons testing area near the village of Nyonoksa in Arkhangelsk region, the Interfax news agency cited unnamed security sources as saying.
The Nenoksa facility conducts test for practically all missile systems used by the Russian navy, including sea launched inter-continental ballistic missiles, cruise missiles and aircrafts.
The Russian Defense Ministry initially denied that any form of contamination was released in the explosion, but later said that a "short-term spike in radiation levels" was detected in the nearby city of Severodvinsk.
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Both were civilian specialists, the country's defence ministry said in a statement.
It was not clear exactly when the explosion occurred but the defence ministry made an official statement on the accident around 1 pm.
Authorities reported the brief spike in radiation within the close by city of Severodvinsk, which has a population of 185,000.
On August 6, one person died and eight people were wounded in a series of blasts at an ammunition depot in the Siberian region of Krasnoyarsk Krai.