At least five people were killed and 40 injured on Wednesday (March 22) when an attacker drove a car through the crowd along Westminster Bridge in London and crashed near parliament.
Those dead included the assailant and a police officer.
The incident in London is the latest in a disturbing trend of vehicles being used as weapons in attacks around the world.
Here are four other incidents.
Jan 2017: Jerusalem lorry attack
On Jan 8, four Israeli soldiers were killed and at least 15 Israelis injured when a man ran them over with a lorry in Jerusalem.
After driving into them at high speed, the lorry reversed and ploughed into the crowd again.
Police called it "a terrorist attack, a ramming attack".
Israeli Prime Minister Benjamin Netanyahu said the assailant, who was shot dead by soldiers, was likely a supporter of the Islamic State in Iraq and Syria.
Palestinian officials said the attacker was a Palestinian from the East Jerusalem neighbourhood of Jabel Mukaber.
Dec 2016: Berlin Christmas market attack
A man driving a lorry ploughed through a busy Christmas market in Berlin, Germany, on Dec 19, killing 12 people and injuring more than 50 others.
The vehicle smashed wooden stalls and crushed victims at the market, which was frequented by both locals and tourists.
German authorities launched a manhunt across Europe for the attacker, 24-year-old Tunisian Anis Amri.
The prime suspect was shot dead by Italian police in Milan on Dec 23.
Nov 2016: Ohio university attack
On Nov 28, an 18-year-old Somali immigrant drove a car into a group of pedestrians on a university campus in Ohio.
The attacker Abdul Razak Ali Artan was a student at the Ohio State University where he carried out the assault. After driving into pedestrians, he jumped out and stabbed passers-by with a butcher's knife before being shot dead by a police officer.
More than 10 people were wounded in the attack.
Authorities later said they believe Artan was inspired by terrorist propaganda from ISIS and a dead Yemeni-American cleric. ISIS subsequently released a statement claiming his attack as a response to their call to attack citizens of coalition nations against them, but no evidence of a relation between Artan and the group has been found.
July 2016: Bastille Day attack in Nice
On July 14, a cargo truck was driven into a crowd of some 30,000 revellers celebrating Bastille Day or France's National Day in Nice, France.
The horrific attack, captured on video, killed 86 people and left more than 400 others injured, many of them grievously.
Police shot the driver, 31-year-old Tunisian Mohamed Lahouaiej Bouhlel, dead. ISIS later claimed him as one of their followers.
SOURCES: AFP, CNN, REUTERS, THE STRAITS TIMES