Donald Trump was mocked for suggesting Sweden had suffered a major terror attack, despite no evidence of one, and was having issues because of immigration, during a February speech.

But while the President was ridiculed for his seemingly misinformed comments, some believe the devastating attack in Stockholm on Friday shows he may have been on to something.

A stolen truck plowed through a crowd of unsuspecting shoppers in the nation's capital, killing four and wounding 15 more on Friday afternoon.

Police arrested a 39-year-old Uzbek national with a Stockholm home address, who had expressed support for ISIS online, for allegedly being involved in the terrorist attack.

Trump's comments were promptly dismissed as Sweden's last terrorist incident happened in 2010, but Friday's attack shows tensions and threats are real in the Scandinavian country.

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A stolen truck plowed through a crowd in Stockholm, killing four and wounding 15 more on Friday. People were seen running for their lives after the truck crashed into Ahlens, a department store in Klarabergsgatan, at around 3pm local time

A man in scrubs was seen walking along the street with several bodies, which have been covered by blankets, behind him. At least four people have died and witnesses described the scene as a 'warzone'

In February, Trump said at a Florida rally that Sweden was 'having problems' and referenced a terrorist attack that never happened. Now people are wondering if he was right about the tensions and threats the country is facing due to immigration

Around 3pm local time on Friday, a hijacked beer truck plowed down pedestrians on Klarabergsgatan before crashing into a shopping center and bursting into flames.

Following the crash, armed terrorists were seen running into Stockholm's Central railway station and opening fire. Two people were also said to have been stabbed.

Men jumped out from inside the vehicle and opened fire before trying to stab pedestrians, witnesses said.

Prime Minister Stefan Lofven said in a news conference shortly following the deadly attack: 'Sweden has been attacked. This indicates that it is an act of terror.'

Almost seven weeks before, Trump possibly foreshadowed the harrowing events while speaking at a rally in Melbourne, Florida, in late February.

Trump clarified the next day he was referencing a Fox News report on immigrants and Sweden

The president was promptly mocked online for his comments. Former Swedish Prime Minister Carl Bildt tweeted: 'Sweden? Terror attack? What has he been smoking? Questions abound'

Trump said: 'You look at what's happening in Germany, you look at what's happening last night in Sweden.

'Sweden, who would believe this? Sweden. They took in large numbers. They're having problems like they never thought possible.'

He later clarified he was referencing a Fox News report.

Trump tweeted the next day: 'My statement as to what's happening in Sweden was in reference to a story that was broadcast on @FoxNews concerning immigrants & Sweden.'

People were quick to mock the president, as there was no terrorist attack on Sweden the night before he made his comments.

Even Former Swedish Prime Minister Carl Bildt chimed in and tweeted: 'Sweden? Terror attack? What has he been smoking? Questions abound.'

In the Stockholm attack, the back of the truck, sticking out of the shopping center, is seen here moments after ramming several people as they were out shopping

This image shows an injured person being carried from the chaotic scenes at Ahlens, a department store in Stockholm where the truck crashed

Now people have taken to Twitter to ask whether Trump was right all along about Sweden's problems with immigrants and terrorism.

One user wrote: 'How are people "shocked" and "saddened" by this truck attack in #Stockholm? This is nothing new and Trump warned everyone.'

Paul Joseph Watson, a popular British YouTube and radio personality, said: 'It seems that Trump has unfortunately been proven right about Sweden.' Twitter user Deena said: 'People mocked President Trump when he said Sweden was having issues with Radical Islamic terrorism. Turns out he's right again!'

People have taken to Twitter to ask whether Trump was right all along about Sweden's problems with immigrants and terrorism

Paul Joseph Watson, a popular British YouTube and radio personality, said: 'It seems that Trump has unfortunately been proven right about Sweden'

Some boasted that Trump was 'right again' following the harrowing attack

Twitter user Susie mentioned Trump's February comments and how Sweden officials responded to him calling him 'crazy'

Sweden was previously dubbed as the the safest place on Earth by politicians.

The most recent was a failed suicide bomber in 2010.

Trump's outspoken remarks drew a wave of international criticism but prompted renewed debate over Sweden’s refugee policy.

Some politicians say the country has struggled to deal with the huge numbers of migrants who have traveled there to enjoy the high quality of life.

The surge at the peak of Europe’s refugee crisis in 2015 saw a record 163,000 asylum applications in just one year.

The influx, to a country with a population of 10million, prompted officials to put in place additional checks at the country’s borders.

Since 2012 around 300 people have traveled from Sweden to join violent Islamist groups – making the country one of the largest contributors to terrorist cells in Europe.