An explosive device went off outside Greece's labour ministry in central Athens early on Saturday but caused no injuries, Greek police said.
A Greek newspaper received a phone call from an unknown caller that a bomb had been planted at the ministry and had informed the police, who cordoned off the area before the explosion, which caused damage to the building and broken windows, police said.
The caller said a previously unknown guerrilla group was behind the attack, a police official said on condition of anonymity.
Police have launched an investigation into the incident.
Greece has a history of political violence. Small bomb and arson attacks are frequent, and most of them do not cause serious damage.
However, the government said it was worried by the incident.
"The attack is very serious and has to do with a serious crime," government spokesman Pavlos Marinakis told Open TV broadcaster on Saturday.
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.
The death toll from a landslide a week ago in Indonesia's West Java province has risen to 49, the country's main rescue agency Basarnas said on Saturday, with 15 still missing.
The Syrian government and Kurdish forces declared a ceasefire deal on Friday that sets out a phased integration of Kurdish fighters into the state, averting a potentially bloody battle and drawing US praise for a 'historic milestone'.
US President Donald Trump said it was dangerous for Britain to be getting into business with Beijing, as Prime Minister Keir Starmer lauded the economic benefits of resetting relations with China during a visit there on Friday.
Israel has released 15 bodies of Palestinians killed during its war in Gaza, three days after recovering the remains of the last hostage, in moves mediators hope will pave the way to carrying out the next stage of US President Donald Trump's peace plan.
There is a low risk of the deadly Nipah virus spreading from India, the World Health Organisation said on Friday, adding that it did not recommend travel or trade curbs after two infections reported by the South Asian nation.
President Donald Trump has endorsed a spending deal negotiated by US Senate Republicans and Democrats on Thursday that would stave off a government shutdown while lawmakers continue negotiating guardrails to rein in immigration agents.
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