Russian's state nuclear company says five people were killed in Thursday's rocket explosion on a naval test range.
A statement from Rosatom said three people were also injured in the incident.
They say the staff members suffered serious burns in the accident, which has been shrouded by mystery.
On Friday Russian government sources said two people died and six were injured in the Nyonoksa blast.
At least eight die, 18 missing after ferry capsizes off North Cyprus
At least eight people died and 18 were missing after a ferry carrying around 270 passengers and crew capsized off north Cyprus on Sunday, leaving survivors clinging to its overturned hull.
Rescuers battle floods and debris as Himalayan disaster death toll nears 800
Rescuers in Nepal and China raced on Sunday to find thousands of people missing after a glacier collapse unleashed a catastrophic mudslide across the Himalayas, as they faced challenging weather conditions and rising water levels.
Manhunt underway after woman killed, several injured at Swiss shooting
A 22-year-old woman has been killed and five people injured, one seriously, in a shooting overnight at a rave in the Swiss town of Aarau which local police said could have been an act of terrorism.
Israeli strike kills two Palestinians, Gaza medics say
An Israeli airstrike near a bakery in Deir Al-Balah killed two Palestinians, including a three-year-old child, and wounded several others on Sunday, health officials said.
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