Russian nuclear agency Rosatom has confirmed that five of its officers killed in a rocket test at a military site in the north of the country, the RIA news agency reported earlier this morning.
The accident occurred when a test was carried out on a liquid rocket propulsion fan, the agency quoted Rosatom as saying.
Russian authorities previously said two people were killed in the rocket incident while a nearby city reported an increase in radiation levels when a rocket engine exploded at a test site in Arkhangelsk on Thursday.
Authorities said they had to close part of the bay in the White Sea to shipping activities.
Meanwhile, regional media reported that locals had begun increasing their supply of iodine to reduce the effects of radiation exposure after the incident.
The Russian Defense Ministry has not yet released a full statement.