MPs held a minute's silence in the House of Commons in tribute to those killed in Wednesday's terror attack.
The silence was held at 9.33am in tribute to Pc Keith Palmer, the police officer killed in the attack, who wore the shoulder number 933.
As the House of Commons opened, Speaker John Bercow said: "Colleagues, in respectful memory of those who lost their lives in yesterday's attack and of all of the casualties, we shall now observe a minute's silence."
Both the House of Commons and the House of Lords took the decision to sit on Thursday after Prime Minister Theresa May said in a statement that any attempt to defeat the values Parliament stands for was "doomed to failure".
Speaker John Bercow is under fresh pressure over his impartiality after a video emerged in which he admitted he voted for Britain to remain in the European Union.
Bercow is already facing a motion of no confidence after suggesting President Trump should not be allowed to speak in Parliament during a state visit.
Constitutional expert, Professor Vernon Bogdanor, told ITV News that the Speaker represents the House of Commons and therefore "it is not for the Speaker to put his own views forward in public".
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Police have charged a 23-year-old man afterhe spent eight hours on the roof of the Palace of Westminster.
Braydon Liam Anderson, of Portland Place, Northampton was charged with criminal damage and trespass on a protected site.
He will appear in custody at Westminster Magistrates' Court tomorrow.
The Met Police has confirmed a man has been arrested after scaling Palace of Westminster roof.
At approximately 9.15pm on Saturday, March 7 officers were made aware of a 23-year-old man on the roof at the Palace of Westminster.
Police negotiators were called to the scene and London Fire Brigade and London Ambulance Service were also in attendance.
At 5am on Sunday, March 8 the man was detained.
He was arrested on suspicion of criminal damage and trespassing.
He has been taken to a central London police station pending further enquiries. At this stage it is too early to ascertain the reason as to why the man was trespassing on the roof.
Video footage taken of the Palace of Westminster appears to show an unidentified man on the roof. It is not known if this is a member of the fire brigade.
A man has scaled the roof of House of Commons while fire fighters and police attend the scene.