Grief and anger are boiling over in Magdeburg after an attacker used an access lane for emergency vehicles to drive into a Christmas market, killing five people and injuring hundreds.

On a visit on Saturday, German Chancellor Olaf Scholz, ministers and regional political leaders were heckled by members of the public, some seemingly outraged by what was criticised as a lapse in security.

German authorities have defended the layout and security at the market.

Authorities are also facing questions after reports that they were warned last year about the suspect, with police saying they had conducted an evaluation as to whether the perpetrator might be a potential threat a year ago.

The suspect has been ordered into pre-trial detention and faces charges of murder, attempted murder and dangerous bodily harm.

• Full report: Five dead, more than 200 injured in attack
• Explained: What we know so far about Magdeburg Christmas market attack
• From the scene: Eyewitness heard rumbling and shattering glass

Usually at this time of the year, German city centres are full of shoppers and revellers drinking mulled wine, but this year the mood is very different.

The main Christmas market is cordoned off by tape and surrounded by police vans as armed officers patrol the shops and malls nearby.

There is sadness in the air in Magdeburg, as well as bafflement and anger, as people ask how could this have happened.

As Scholz and his colleagues walked out of the cordoned-off market during their visit on Saturday, they were met with booing and heckling and shouts of "hau ab", an extremely aggressive form of "get lost".

Some people seemed enraged by a perceived lapse in security. Others appeared simply annoyed and irritated in general at Germany's political leaders.

Security has ramped up at Christmas markets across Germany since a similar attack in Berlin in 2016 when a man drove a lorry into a market crowd, killing 12 people.

Open-plan Christmas markets now have some sort of barrier around them — typically large concrete blocks, which is the case in Magdeburg.

However, the gap in the barriers was large enough to allow emergency vehicles to pass through.

City official Ronni Krug told reporters at a press conference on Saturday that emergency responders needed an evacuation route in case of a "conventional" emergency, and all the relevant agencies approved the plan.

"A safety and security concept must, on the one hand, protect those visiting an event as much as possible, but also needs to ensure, at the same time, if something does happen, they are able to leave the site safely and rapidly", he said.

"Perhaps it is something that could not have been prevented", he added.

German media reported that before the attack, there had been warnings into a potential threat from the suspect.

The suspect, a doctor from Saudi Arabia named Taleb al-Abdulmohsen, arrived in Germany in 2006 and in 2016 was recognised as a refugee.

An atheist, he ran a website that aimed to help other former Muslims flee persecution in their Gulf homelands. His social media was full of anti-Islamic sentiment and conspiracy theories.

At Saturday's press conference, Magdeburg police chief Tom-Oliver Langhans said police had conducted an evaluation as to whether the perpetrator might be a potential threat, "but that discussion was one year ago".

He added that investigations into the suspect's past were ongoing and declined to comment further.

One of those tip-offs is believed to have come from Saudi Arabia, the suspect's home country.

A source close to the Saudi government told the BBC it sent four official notifications known as "Notes Verbal" to German authorities, warning them about what they said were "the very extreme views" held by al-Abdulmohsen.

However, a counter-terrorism expert told the BBC the Saudis may have been mounting a disinformation campaign to discredit someone who tried to help young Saudi women seek asylum in Germany.

On Saturday, Langhans said he did not have information when asked about Saudi Arabia issuing warnings.

Later, the head of the Federal Criminal Police Office (BKA), Holger Münch, told public broadcaster ZDF that his office had received a notice from Saudi Arabia in November 2023. He said local police took appropriate investigative measures, but the matter was unspecific.

He added that the suspect "had various contacts with authorities, insulted them and even made threats, but he was not known for violent acts".

Past investigations would need to be revisited, Münch said.

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.

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.

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.