It's been revealed that a teenager who was stabbed on a bus in north London on Tuesday had been celebrating his 16th birthday.
Derek Boateng was fatally injured in the attack at Highbury New Park.
A 15-year-old boy has been arrested on suspicion of murder and remains in custody at a north London police station.
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PC Keith Palmer will be remembered permanently at the National Memorial Arboretum, Home Secretary Amber Rudd has said.
ITV News rounds up the best pictures of the day as campaigners make a final stand before Theresa May triggers Brexit on Wednesday.
Demonstrators are gathering to march through central London towards Parliament Square, the scene of Wednesday's terror attack.