Latest: Third victim of Westminster attack named as American tourist Kirk Cochran

Latest: Four people were killed in the attack in Westminster yesterday. These were: Aysha Frade, 43; a man in his mid 50s, PC Keith Palmer and the attacker.

• Four people were killed in the attack in Westminster yesterday. These were: Aysha Frade, 43; a man in his mid 50s, PC Keith Palmer, US tourist Kirk Cochran and the attacker - 52-year-old Khalid Masood;
• 29 people were treated for their injuries in hospital, incuding one Irish person; seven of these are critically ill; numbers of ‘walking wounded’ are still being collated;
• The attacker has not yet been publicly identified, and police have asked the media to not yet do so;
• The Westminster attacker was a British citizen who was known to the police and security services and had been investigated some years ago over violent extremism, Theresa May has confirmed;
• The Islamic State group has said through its Aaamaq news agency that the London attacker was a "soldier of the Islamic State";
• Eight people have been arrested in raids at six addresses in connection with the investigation overnight; The raids took place in London, Birmingham and at other, undisclosed, locations;
• Metropolitan Police say the attacker acted alone, but was ‘inspired by international terrorism’;
• British Defence Secretary Michael Fallon has said the working assumption is that the Westminster attack is linked to Islamic terrorism.

Update 4.30pm: Donald Trump has paid tribute to tourist Kurt Cochran, who was among the three people killed in yesterday's terrorist attack in London.