Retired soldier waging war against litterbugs in Xi'an

A military veteran is not letting the aches and pains of old age get in the way of his desire to keep the streets of an ancient Chinese city pristine.

Zeng Ming, 92, goes about his work with all the stoicism and dedication of a soldier on that most tedious of tasks - guard duty.

A couple of years ago, duty called yet again and he signed up for the civilian service, not realizing at the time that his new adversary would be cigarette butts and that the streets of Xi'an, Shaanxi province, would be his new field of battle.