Conservative MP Sir David Amess has died after being stabbed multiple times at his constituency surgery in Essex.
Police said a 25-year-old man was arrested on suspicion of murder after the attack at a church in Leigh-on-Sea.
They recovered a knife and are not looking for anyone else in connection with the incident. A counter terrorism team will lead the investigation.
Boris Johnson has spoken of his shock and sadness at the loss of "one of the kindest" people in politics.
Home Secretary Priti Patel has asked all police forces to review security arrangements for MPs "with immediate effect", a Home Office spokesman said.
Sir David, 69, had been an MP since 1983 and was married with five children. He is the second serving MP to be killed in the past five years, following the murder of Labour MP Jo Cox in 2016.
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