The City of Westminster: A timeline of terror
Tuesday 14 August 2018 18:05, UK
Westminster has become a key target for terrorists seeking to commit mass murder on the streets of the UK.
Since March 2017 - when Khalid Masood killed five people and injured more than 50 others outside Parliament - central London has been the subject of multiple schemes with similarly deadly intent.
While some have been foiled, others have slipped through the net.
The latest - in which a car crashed into security barriers as it sped towards Westminster Abbey - could so easily have claimed lives.
Almost 18 months on from Masood's rampage, Sky News looks back on a period of numerous terror plots at the heart of the capital.
Kent-born Khalid Masood, 52, began his attack by driving a grey Hyundai across Westminster Bridge, hitting pedestrians along the way and killing two.
He crashed the car into railings outside Parliament and entered the grounds of the Palace of Westminster, where he fatally stabbed police officer Keith Palmer.
Masood was shot dead by police as the House of Commons was suspended, with the attack condemned by Theresa May as "sick and depraved".
The Metropolitan Police later confirmed that five people had died - PC Palmer, teacher Aysha Frade, US tourist Kurt Cochran, retired window cleaner Leslie Rhodes, and Romanian tourist Andreea Cristea.
More than 50 other people were hurt, some with "catastrophic injuries".
Khalid Ali plotted a knife attack on MPs and police in Westminster but was arrested in Parliament Square before he could carry out his crimes.
The 28-year-old - who had been watched by police since returning from a stint as a Taliban bomb-maker in Afghanistan - was found in possession of three knives and taken into custody.
Before his arrest, he had been carrying out reconnaissance at locations including Downing Street, the Cenotaph, the Houses of Parliament, and the MI6 building.
He has since been sentenced to a minimum of 40 years in jail for making IEDs for the Taliban in 2012, and a 25-year sentence for the Westminster plot designed to attract "maximum publicity and instil terror".
Naa'imur Zakariyah Rahman, an Islamic State terrorist from Finchley in north London, wanted to bomb the gates of 10 Downing Street and behead Theresa May.
His plot was discovered after he contacted an FBI agent posing as an IS official online, who then introduced him to another role-player from MI5.
Rahman spoke of using a "suicide bomb" and a "suicide belt", as well as a drone, improvised explosives and poison.
He carried out reconnaissance at Whitehall in November 2017 and later met an undercover officer in Brixton, who he thought was going to fit his rucksack with explosives.
Instead, he was arrested as he walked away in Kensington and found guilty of preparing acts of terrorism in Britain earlier this summer.
Self-styled teacher Umar Haque, 25, was planning to use guns and a car packed with explosives to hit 30 high-profile targets - including Big Ben.
Heathrow Airport and the Queen's Guard were also on his list.
The "really dangerous individual" trained children as young as 11 to carry out terrorist attacks, leaving some of the youngsters "almost paralysed with fear", police said.
A specialist social worker found that nine youngsters - aged between 11 and 13 - suffered "flashbacks" and "nightmares".
The Islamic State supporter provided tutelage by role playing attacks at Ripple Road mosque in Barking, east London.
He also played IS propaganda to pupils at a fee-paying Muslim school - Lantern of Knowledge in Leyton.
Haque aimed to create an "army of children" to spread fear across London and was found guilty of planning terror attacks at the Old Bailey earlier this year.
The first terror group made up entirely of women planned to carry out a knife attack in Westminster.
In June, Rizlaine Boular, 22, was jailed for a minimum of 16 years, and her mother, Mina Dich, was jailed for six years and nine months.
Boular planned to stab random members of the public around the Palace of Westminster to cause widespread panic, injury and death, the Old Bailey heard.
She had taken the idea from her younger sister Safaa, who was sitting her GCSEs when she was seduced by IS fighter Naweed Hussain.
The 18-year-old was later handed a life sentence for her role in the plot.
Three people were injured when a car crashed into security barriers outside Parliament.
The silver Ford Fiesta hit cyclists and pedestrians at 7.37am before crashing into the security barriers.
Sky sources say the suspect - a man in his 20s - has been identified and is from the Midlands.
Three people were treated at the scene, two of whom were taken to hospital. A woman has serious but not life-threatening injuries while a man has been discharged.
The driver, wearing a white shirt and a black hooded puffer jacket, was detained at the scene.
The incident is being investigated by counter-terror officers.