The case has shaken the United Kingdom for a week.
Last Friday, Tory MP David Amess was stabbed to death while talking to citizens at a church in Leigh-on-Sea, 37 miles from London.
His death shocked the country, five years after the assassination of Labor MP Jo Cox by a right-wing extremist.
If no demands were made public, the British police quickly mentioned "a potential motivation linked to Islamist extremism".
The country has indeed seen several knife attacks in recent years, some of which have been claimed by the Islamic State.
Arrested on the spot, Ali Harbi Ali, a 25-year-old man of Somali origin, was charged today with murder and preparation for a terrorist act.
A British national and having studied at a Catholic school, he had completed an anti-radicalization program and was not considered dangerous by the authorities.
A friend of his, quoted by the tabloid The Sun, said he had “completely radicalized on the Internet” and had admired the preacher Anjem Choudary, a figure of the radical Islamist movement in London.
But his real motives, as well as his intentions after this murder, remain unclear.
According to the Times, investigators are examining, among the avenues being considered, the MP's ties to the state of Qatar.
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