Counter-terrorism police have been searching a home in Birmingham where friends of Westminster attacker Khalid Masood lived.
Security at UK Parliament's gates was breached last year by an intruder who flashed fake identification and wandered around the estate for 12 hours, it has been claimed.
The "selfless bravery" of the policeman killed in the Westminster terror attack has been hailed by his family, who thanked those who fought to save his life.
Fears Westminster terrorist Khalid Masood was groomed for extremism in prison have heightened after it was claimed he turned to Islam behind bars.
Khalid Masood who killed four people during a terror rampage in London had made three trips to Saudi Arabia, the country's embassy in Britain confirmed.
A fundraising page for a Westminster terror attack victim has been taken over by JustGiving amid fears it was set up by a fraudster.
Counter-terrorism detectives are attempting to trace any associates of Khalid Masood as they mount a huge investigation to establish what triggered the terrorist's murderous rampage in Westminster.
Here is what we know about the victims of the Westminster attack.
The Romanian woman who fell from London's Westminster Bridge into the River Thames during the terrorist attack was due to receive a marriage proposal later that day.
An American tourist has shared a photo of herself with Pc Keith Palmer outside Parliament.
The widow of a man slashed in the face by Khalid Masood told how she felt "sick" after hearing he went on to commit the atrocity in Westminster.
Enda Kenny has signed a book of condolence for the victims of Wednesday's Westminster terror attack.
The fourth victim has been named.
Masood was jailed for two years over the 2000 attack.
The fifth person to be killed in the Westminster terror attack was pensioner Leslie Rhodes.
"I have heard nothing that suggests to me that it would have been possible to stop it."
Garda HQ will conduct a fresh review of security strategies after the London terrorist attack and are monitoring the reaction of a small number of jihadist sympathisers here.
Latest: Two more "significant arrests" have been made in connection with the Westminster attack, police have said.
Defiance and quiet dignity were shown at a vigil to the victims of the Westminster attack, hours before police said a 75-year-old man had died from injuries sustained in Wednesday's outrage.
Victims of the Westminster terror attack are being treated in hospitals across the capital, though some who were admitted have now been discharged.