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.
US snatches airman from Iran as Trump, Israel ratchet up pressure
US special forces rescued a downed airman in Iran in a complex operation that averted a potential crisis for President Donald Trump, as the war entered its sixth week with little sign of progress in diplomatic efforts for a resolution.
Ships near Italy rescue 32 migrants as 71 remain missing
Two merchant vessels near the Italian coast recovered the bodies of two migrants and rescued 32 survivors from a boat trying to cross to Europe from Libya on Easter weekend, rescue charities said, citing the survivors as saying 71 others were lost at sea.
Nigerian army rescues 31 hostages after church attack
Nigeria's army said on Sunday that it had rescued 31 civilians who were taken hostage during an attack on a church in northwest Kaduna state, while five people were found dead at the scene.
At least 11 killed in Israeli airstrikes in Lebanon
An Israeli airstrike on Kfarhata, a village in south Lebanon, killed seven people on Sunday, including a 4-year-old child, while another attack on the Jnah neighbourhood in Beirut killed four people and injured 39 others, Lebanon's health ministry said in a statement.
Kuwait Petroleum Corp reports damage at units after Iran drone attacks
Iranian drone attacks hit various targets in Kuwait on Sunday, with state energy company Kuwait Petroleum Corporation (KPC) reporting fires and "severe material damage" at some operating units.
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