Nitazenes, which can be stronger than fentanyl, are behind an increase in overdose deaths, the UN says.
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Spanish police called on volunteers with expertise of harsh terrain to help find the 19-year-old.
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Conservative Saeed Jalili has taken a narrow lead over reformist Massoud Pezeshkian.
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A selection of striking news photographs taken around the world this week.
Sabrina the Teenage Witch star Martin Mull dies aged 80
He died at home after a “valiant fight against a long illness”, his daughter said.
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Party leaders have been asked about where they stand on the topic of single-sex spaces.
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Snarky jibes and silly memes have been a hit on TikTok but the real social battle is elsewhere.
Why do politicians keep talking about locks?
The 2024 election campaign has seen further growth in British politicians' favourite metaphor.
Dua Lipa hits all the right notes at Glastonbury
The pop star delivered an ambitious and exhausting set as she headlined the Pyramid Stage.
Dua Lipa hits all the right notes at Glastonbury
The pop star delivered an ambitious and exhausting set as she headlined the Pyramid Stage.
The drugs and guns kingpin who sparked a global manhunt
A leading figure in Nottingham's notorious "Shottingham" era is facing a new prison sentence.
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A poor debate performance has fuelled Democrat unease about Mr Biden's candidacy.
New portrait of King released for Armed Forces Day
The monarch is pictured wearing his dress uniform, as the Queen pays tribute to service personnel.
'There was no preparation': One marine's story of defending Kharkiv
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Was there a massacre after Kenya's anti-tax protests?
Reports of a mass killing by police in a Nairobi suburb spread quickly. The BBC looked for the evidence.
IS: A persistent danger, 10 years since its peak
What happened to the violent jihadist group which was once one of the biggest threats in the world.
Dying together: Why a happily married couple decided to stop living
Jan and Els sought medical intervention to end their lives after 50 happy years of marriage.
Aer Lingus pilots set to begin strike action
The strike action, which will last for eight hours, starts at 05:00 local time on Saturday.
French PM in final appeal to stop far-right victory
France's election campaign is over, and voters appear ready to hand National Rally victory.
Biden vows to fight on in first speech after Trump debate
The president says he would not be running if he could not do the job, after his performance sparked concern among Democrats.