A British lawmaker was shot to death while meeting with constituents Thursday in an attack that halted campaigning over whether the U.K. should leave the European Union.
Police said they arrested a 52-year-old man in the attack on Jo Cox, but did not know of a motive for the killing. The attack came a week before British voters were scheduled to decide whether to leave the EU. Cox, a 41-year-old member of the opposition Labour Party, had been campaigning to keep the U.K. in the European Union.
Cox was meeting voters in her West Yorkshire, northern England, constituency when she was attacked.
Authorities said in a news conference that they are conducting a "very significant investigation," appealing to witnesses for more information.