Alzheimer's Disease

Manchester attack transforms Britain's election campaign

Until a week ago, two things were widely agreed about Britain's upcoming general election: it was producing the dullest campaign in recent memory and the result was a foregone conclusion. It would be a coronation march for Conservative Prime Minister Theresa May.

Then a bomb blast killed 22 people at a concert in Manchester, bringing campaigning to a shocked halt. When the debates, ads and stump speeches resumed three days later, they were delivered to a jittery nation on a transformed political landscape.

Security now is the dominant theme in a contest that was supposed to be about Britain's exit from the European Union, with the main parties battling over which can keep...