Heavy snowfall and plummeting temperatures shut schools and shops in the Greek capital on Monday, with many public services and businesses switching to remote working.
Traffic was halted on some central roads and on a national road connecting Athens to central Greece, as storm Barbara swept across the country, blanketing the capital.
Some metro stations close to the city's international airport were also shut and train routes to the northern city of Thessaloniki were suspended.
Authorities urged the public to avoid non-essential travel.
Fire brigade rescue crews had evacuated four people whose car was stuck in the snow in the Athens suburb of Aspropyrgos, according to state TV ERT.
The cold snap was expected to last until Tuesday, gradually affecting eastern and southern regions, including the island of Crete.
Heavy snow is rare in the Greek capital but the country has now been hit by extreme weather for a third consecutive winter. Until Monday's snow, winter in Greece has been unusually mild so far this year.
Gaza's main border crossing in Rafah will reopen for Palestinians on Monday, Israel said, with preparations underway at the war-ravaged enclave's main gateway that has been largely shut for almost two years.
Nearly 90 people have died in bitter cold affecting areas of the United States from Texas to New Jersey, according to media reports citing local authorities.
Pakistan's security forces killed 145 militants over 40 hours after coordinated attacks across Balochistan, the chief minister of the southwestern province said on Sunday, as the authorities battle one of the deadliest flare-ups in years.
Israel carried out its heaviest airstrikes in Gaza in weeks on Saturday, killing 26 people according to local health authorities, in attacks on a Hamas-run police station and on apartments and tents in an area sheltering displaced Palestinians.
The US government entered what is expected to be a brief shutdown on Saturday after Congress failed to approve a deal to keep a wide swath of operations funded ahead of a midnight deadline.
Thousands of protesters took to the streets in Minneapolis and students across the United States staged walkouts on Friday to demand the withdrawal of federal immigration agents from Minnesota following the fatal shootings of two US citizens.
France has lowered the safety limit for cereulide toxin in infant formula, aiming to strengthen protections after several major groups ordered worldwide recalls over contamination concerns, the farm ministry said on Saturday.
An ally of Indian Prime Minister Narendra Modi has proposed a bill to ban social media for children, as the world's biggest market for Meta and YouTube joins a global debate on the impact of social media on young people's health and safety.
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