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On Wednesday afternoon a police officer was stabbed and killed by an assailant outside the British Houses of Parliament.
A car then ploughed into a crowd of people on Westminster bridge, killing one woman and injuring at least 10. Three French teenagers on a school trip to London were also badly injured in the attack.
At the moment, the situation remains fluid and facts are scarce. indy100 is updating their page with exactly what we know and what we don't know throughout the evening.
Elsewhere on the internet, Donald Trump Jr, Donald Trump's eldest son, decided to share an article from seven months ago.
Mr Trump Jr shared anIndependent article titled: Sadiq Khan: 'London mayor says terror attacks 'part and parcel' of living in a major city.'
You have to be kidding me?!: Terror attacks are part of living in big city, says London Mayor Sadiq Khan https://t.co/uSm2pwRTjO — Donald Trump Jr. (@Donald Trump Jr.)
His comment alongside the article read:
You have to be kidding me?!
The article was originally posted in September 2016, and was a plea from the Mayor for Londoners to be vigilant to the dangers of living in a big city.
The Mayor told the Evening Standard that he had many 'sleepless nights' after a bombing in New York last year, and said that London needs to be prepared for these kinds of attacks.
That means being vigilant, having a police force that is in touch with communities, it means the security services being ready, but it also means exchanging ideas and best practice.
Donald Trump Jr's choice to share a seven month old article, seemingly without reading it or pointing out that it was an old quote, was received with disbelief and overwhelming denigration.
Channel 4's Ciaran Jenkins asked if Mr Trump Jr had even read the article "before goading London's Mayor during a live incident'.
@DonaldJTrumpJr And we absolutely don't choose to scapegoat whole communities to make ourselves feel better. Now shut the hell up. — Tom Coates (@Tom Coates)
How dare you @DonaldJTrumpJr you take an article from @MayorofLondon from a year ago and do this at a time like this. #London — Yasmin Khatun Dewan (@Yasmin Khatun Dewan)
@DonaldJTrumpJr how DARE you post this as if he said it today. — Marie Donn (@Marie Donn)
More: Westminster terror incident: What we know and what we don't know
Watch:London attack: What you need to know