Britain's Prime Minister Boris Johnson visits the scene of a stabbing on London Bridge, in which two people were killed, in London, Britain, November 30, 2019. REUTERS/Simon Dawson

LONDON (Reuters) - The lead for British Prime Minister Boris Johnson’s Conservatives over the Labour Party has narrowed sharply to six points from 13 a week ago, according to a poll by BMG for the Independent newspaper conducted before the London Bridge attack.

The Conservatives were on 39%, down 2 points, compared with the last BMG poll published on Nov. 23.

Labour rose five points to 33%. The Liberal Democrats fell five points to 13% and the Brexit Party gained one point to 4%.

The poll was the latest of several surveys by various polling firms to show a tightening of the race in recent days.

BMG polled 1,630 British voters online between Nov. 27 and 29. Polling was completed before an attack on Friday by a man carrying knives who killed two people before being shot dead by police on London Bridge.