On Friday evening, a man ploughed a car into a crowd of shoppers at a Christmas market in the German city of Magdeburg.
The attack has left five people dead and more than 200 injured, with many in a critical condition.
One man has been arrested over the attack, and police believe he was solely responsible.
German Chancellor Olaf Scholz travelled to Magdeburg on Saturday, and a city councillor declared Christmas over for the city.
How did the attack unfold?
Unverified footage on social media showed a black BMW travelling at high speeds through the pedestrian walkway between Christmas stalls.
Eyewitnesses described jumping out of the car's path, fleeing or hiding. One told the Reuters news agency that police were already at the venue and chased after the car before arresting the suspect.
Footage from verified sources showed armed police confronting and arresting a man who can be seen lying on the ground next to a stationary vehicle - a black BMW with significant damage to its front bumper.
BBC correspondent Damien McGuinness in Magdeburg reported that the market is "surrounded by concrete blocks". However, "there is a gap which is wide enough for pedestrians to go through, but tragically wide enough for a car to go into the Christmas market", he said.
City officials said around 100 police, medics and firefighters, as well as 50 rescue service personnel rushed to the scene in the aftermath of the attack.
Images from the scene on Friday night showed an area outside the market awash with blue lights as dozens of first responders attended to the injured.
Video shows arrest of Magdeburg attack suspect
Who are the victims?
Five people have died in the attack, one of whom is a child.
More than 200 people have been injured and at least 41 are in a critical condition.
The toll had earlier been reported as two dead and 68 injured, but was revised to the much higher totals on Saturday morning.
None of the victims have been identified yet.
Reuters
Tributes have been left at a church by the scene
Who is the suspect?
German media has identified the suspect as Taleb A, a psychiatrist who lives in Bernburg, around 40km (25 miles) south of Magdeburg.
The motive behind the attack remains unclear, but authorities have reported that they believe he carried out the attack alone.
Originally from Saudi Arabia, he arrived in Germany in 2006 and in 2016 was recognised as a refugee.
He ran a website that aimed to help other former Muslims flee persecution in their Gulf homelands.
Evidenced by social media posts, the suspect is an outspoken critic of Islam, and has promoted conspiracy theories regarding a plot to seek Islamic supremacy in Europe.
A report from Der Spiegel said a complaint was filed against Taleb A with the authorities a year ago over statements he made. Officials did not see any concrete threat, the report says.
What have officials said about the attack?
"The reports from Magdeburg raise the worst fears," the German chancellor, Olaf Scholz, said on social media platform X.
Magdeburg's city councillor for public order, Ronni Krug, said the Christmas market will stay closed and that "Christmas in Magdeburg is over", according to German public broadcaster MDR.
That sentiment was echoed on the market's website, which in the wake of the attack featured only a black screen with words of mourning, announcing that the market was over.
The Saudi government expressed "solidarity with the German people and the families of the victims", in a statement on X, and "affirmed its rejection of violence".
UK Prime Minister Sir Keir Starmer said he was "horrified by the atrocious attack in Magdeburg", adding that his thoughts were with "the victims, their families and all those affected" in a post on X on Friday night.
Authorities are still trying to understand why the suspect carried out the deadly attack
Magdeburg's Christmas market is a sad sight. This should have been the busiest weekend of the season, but the whole area has been cordoned off and all the stands are shut.
Police are the only people walking around the boarded-up mulled wine and gingerbread stalls.
On the pavement, red candles flicker, tributes laid for the victims.
Lukas, a truck driver, told me he felt compelled to come to pay his respects. "I wasn't there when it happened," he told me.
"But I work here in Magdeburg. I'm here every day. I've driven by here a thousand times."
"It's a tragedy for everyone here in Magdeburg. The perpetrator should be punished."
"We can only hope that the victims and their families find the strength to deal with it."
There is sorrow here – but there is anger too.
Many people here see this attack as a terrible lapse in security. That is a claim the authorities reject, although they have admitted the attacker entered the market using a route planned for emergency responders.
Michael, who also came to pay tributes to the victims, said "there should've been better security".
"We should have been prepared better but that was not done properly."
Standing at the security cordon, I heard a group of locals complaining loudly about Germany's Chancellor Olaf Scholz and regional politicians.
"They are wasting our tax money, they are just looking out for themselves. They are not interested in us. We just hear empty promises," one man said.
"They are turning what happened here around and want to put the blame on the opposition and use it for their election campaign," he said.
On Saturday evening, around the same time as the square in front of Magdeburg's Gothic cathedral was filled with mourners watching a memorial service, a demonstration took place nearby.
Protesters held a banner that read "Remigration now!" – a concept popular among the far-right – and shouted "those who do not love Germany should leave Germany".
Suspect in German market attack appears in court as anger grows over security lapses
It is not clear yet what impact this attack may have on Germany's upcoming election.
Germany has been hit by a number of deadly Islamist attacks in the past, but investigators said the evidence they have gathered so far suggests a different picture in this case.
Germany's Interior Minister Nancy Faeser said the suspect appears to have been "Islamophobic".
The suspect, Taleb Al-Abdulmohsen, is from Saudi Arabia, and his social media posts suggest he had been critical of Islam.
He also expressed sympathy on social media for Germany's far-right political party, Alternative for Germany (AfD), re-tweeting posts from the party's leader and a far-right activist.
Food costs have surged in Nigeria over the last 18 months
The number of dead from a crowd crush in the south-east town of Okija in Nigeria has risen to 22, police say.
It is the third case this week of people being crushed to death at events where free food was being distributed.
The fatalities in Okija occurred at a charity event on Saturday, when residents rushed to collect Christmas donations, including rice and vegetable oil.
On the same day, a similar tragedy at a Catholic church in the capital city Abuja killed 10 people, while 35 children died during a carnival event on Wednesday in the city of Ibadan.
Police have now warned organisers to notify authorities before holding charity events in order to prevent such loss of life.
Toyin Abdul Kadri, who witnessed the crush at the Holy Trinity Catholic Church in Abuja, told AFP news agency the attendees "forced the gates and forced their selves inside".
The event involved "vulnerable and elderly individuals" and four children were killed, the police said.
In a social media post about the crushes, Amnesty International Nigeria wrote: "President Bola Tinubu's government must urgently prioritise addressing widespread hunger, higher unemployment and the rapidly falling standard of living."
Food and transportation costs have more than tripled in Nigeria in the last 18 months.
The global bout of inflation has been exacerbated by some of the policies of the government – designed to strengthen the economy in the long-term – such as ending a fuel subsidy.
In a statement on the deadly crushes, President Bola Tinubu said: "In a season of joy and celebration, we grieve with fellow citizens mourning the painful losses of their loved ones. Our prayers of divine comfort and healing are with them."
He urged state governments and the police to enforce strict crowd control measures, and has cancelled all his official engagements in honour of the victims.
He also noted the similarities between the incidents, including one earlier this week in the south-west city of Ibadan.
Thousands of people had turned up on the promise of free food.
Residents in Bashorun, a suburb of Ibadan, told the BBC the crowd soon exceeded 5,000 with many attempting to force their way through the school gate. Parents are said to have tried to scale the fence surrounding the compound to gain access.
Police spokesperson Olumuyiwa Adejobi said the three "tragic" incidents highlight the "urgent need for a more structured and effective approach to delivering aid to vulnerable communities and members of the public in general".
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