Police survey the crowds on the second day of the Notting Hill Carnival in west London on Aug. 29, 2016. Daniel Leal-Olivas/AFP/Getty Images
LONDON—Knife detection arches are being used at London’s Notting Hill Carnival for the first time, police said.
London’s Metropolitan Police hope that the “tried and tested method” will deter people from attending the popular parade while carrying knives.
