Teams help keep subways safe for women

Liu Dapeng has spent this summer the same way he spent the last: hunting perverts who target female passengers in crowded subway cars.

He is among dozens of plainclothes police officers who patrol Beijing's vast subway network each day to prevent the sexual assault or harassment of women, the instances of which peak in warm-weather months.

The clampdown campaign was launched in June last year by the Sihui police station in the south of Chaoyang district, and then rolled out citywide over the following two months, with about 20 stations allocating resources.