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Live updates: Westminster attack investigation
Police and intelligence agencies are mounting a massive investigation to establish what led Khalid Masood to carry out the attack on Westminster.
There have also been calls for security services to get access to encrypted messages such as WhatsApp after it emerged that Masood used the messaging service moments before the attack.
Here is the latest on what we know:
- Police have arrested a 30-year-old man in Birmingham in connection with the attack
- Another man of 58 who was arrested on Thursday remains in custody
- Scotland Yard have said the attack was over in just 82 seconds
- They believe Masood acted alone and it may never be known why he did it
- Masood ploughed a Hyundai i40 across Westminster Bridge and stormed the Parliamentary estate armed with two knives, fatally stabbing Pc Keith Palmer before being shot dead by police
- Three other innocent people died in the attack on Wednesday
Live updates
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Westminster terror victim died on first holiday abroad
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Westminster terror attack: New arrest made
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Women form chain on Westminster Bridge to condemn attack
Theresa May's card for victims of Westminster attack
Theresa May has expressed her sympathies to the victims of the "evil and cowardly" Westminster terror attack carried out by Khalid Masood.
The Prime Minister added her handwritten card to piles of tributes outside Parliament.
It said: "With deepest condolences for those who lost their lives as a result of this evil and cowardly attack. Our thoughts and prayers are with them and their families."
Counter-terror police search home near to Masood house
Counter-terrorism police have been searching a home in Birmingham over the weekend where friends of Westminster attacker Khalid Masood lived.
Officers were seen by neighbours on Saturday at the maisonette in Bredon Croft, Hockley, less than 200 yards from a property Masood had lived in until the end of 2016.
Specialist police search teams were still at Bredon Croft home on Sunday removing bags of evidence.
Meanwhile, a 58-year-old arrested in Birmingham remains in custody.
The hunt for the 52-year-old Masood's accomplices saw 11 people held after raids across the country.
- ITV Report
Corbyn calls for security changes after London attack
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Pc Palmer's family thank those who tried to save him
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MP Ellwood 'heartbroken' he could not save Pc Palmer
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Westminster attacker sowed terror in just 82 seconds
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Tributes held around UK for Westminster victims
Latest ITV News reports
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Westminster terror victim died on first holiday abroad
Kurt Cochran and his wife Melissa had been visiting London from the US to celebrate their 25th wedding anniversary and were due to fly home.
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Westminster terror attack: New arrest made
A 30-year-old man was arrested in Birmingham on Sunday on suspicion of preparing terrorist acts.