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Essex crime scene
Photo: ANDREW COULDRIDGE / REUTERS
In the case of the stabbed Tory MP David Amess, the British counter-terrorism unit is supposed to lead the investigation.
The Essex police announced that evening.
Whether the act on Friday was a terrorist attack is still being investigated.
The police arrested a 25-year-old on suspicion of murder.
You are not looking for more people, it said.
A knife was also found at the crime scene.
There was initially no information about a motif.
The man had stabbed the politician several times during a public consultation.
The event took place in a church in the parish of Leigh-on-Sea, Essex.
Amess met there with voters.
The attack on Amess shocked the British public, and numerous politicians gave their condolences.
The flags on Downing Street, the seat of Prime Minister Boris Johnson, were waving at half mast.
The Prime Minister said: "Our hearts are filled with shock and sadness".
Amess was one of the "most lovable and friendliest people in politics."
jpz / muk / dpa