Instead of statements of support or prayers for the victims, Donald Trump Jr reacted to the the London terror attack on Wednesday by criticizing Mayor Sadiq Khan.

Around 1pm ET, Donald Jr re-tweeted an article from September, in which Khan, the city's first Muslim mayor, stated that terror attacks were 'part and parcel' of living in a big city.

Khan gave the interview six-months-ago and his comments were his reaction when asked about the bombs that were detonated in New York City and Jersey in September, injuring 31.

Donald Jr commented in his tweet: 'You have to be kidding me?!'

Donald Trump Jr reacted to the London terror attack on Wednesday by tweeting a criticism of Mayor Sadiq Khan

Donald Jr. (left) re-tweeted an interview with Khan (right) in which the mayor said that terrorist attacks are 'part and parcel' of living in a big city. Donald Jr commented: 'You've got to be kidding me?!'

Many criticized President Trump's eldest son, saying his comments were inappropriate so soon after a tragedy that has so far claimed the lives of at least four people.

'Is it really appropriate, considering your father's position and what's happening today, to attack the Mayor of London?' one Twitter user asked.

Another user added: 'Your complete lack of intelligence continues to show through. It is quite amazing, actually.'

So far, four people have been killed in the terrorist attack on Westminster Bridge and Parliament

Donald Jr was quickly criticized for his comments, which many said were inappropriate and ill timed

The incident in London today was centered in the heart of Britain's seat of power - the Houses of Parliament.

London police say that a knife-wielding man driving a Hyundai 4x4 jumped the curb onto the sidewalk to mow down pedestrians as he drove across the Westminster Bridge towards Parliament Wednesday afternoon.

Once on the other side of the bridge, he crashed into the railings outside of Parliament, where he got out and proceeded to stab an armed police officer to death. He was then shot and killed by responding officers.

In addition to the attacker and the stabbed police officer, two other people have died and 20 more were injured.

Police said they were treating the attacks as a terrorist incident and had launched a full counterterrorism investigation. There was no immediate claim of responsibility from any terrorist organizations.

Since his father took office, Donald Jr and his younger brother Eric have taken over the family business, and in so doing have had to distance themselves from their father so as not to create a conflict of interest.

Sister Ivanka however, is getting an office in the West Wing and top security clearance, it was revealed this week.

Donald Jr, Ivanka and Eric reunited in Aspen this week for a spring break with their families. But Donald Jr's trip was cut short by several days when his five-year-old son Tristan broke his legs on the slopes on Sunday. Donald Jr and wife Vanessa then jetted back to New York, leaving son Donald Trump III with his cousins for the week.