Conservative MP Sir David Amess has died after being stabbed at his constituency surgery in Essex in what police believe was street terror attack..
Police said a 25-year-old Somalian man was arrested on suspicion of murder after the terror attack at a church in Leigh-on-Sea.
They said they recovered a knife and were not looking for anyone else in connection with the incident.
Prime Minister Boris Johnson said "our hearts are full of shock and sadness" at the loss of "one of the kindest" people in politics.
Sir David, 69, had been an MP since 1983 and was married with five children.
The investigation will be led by the Metropolitan Police's specialist Counter Terrorism Command, who will determine whether it was a terrorist incident.
Police and paramedics "worked extremely hard" to save him but he died at the scene.
Sir David Amess: Conservative MP stabbed to death
A 25-year-old man, said by a government source to be a British national, has been arrested on suspicion of murder.
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