As the cameras roll, the tears start to flow

When the camera turned on, the tears of Wang Meizhi, 47, a woman from a village in Hebei province, could not stop. Behind the camera, college student Qu Xiaohan, too, had tears rolling down.

It was the second time Wang, together with Wu Xinghu, a 31-year-old father, had come to Beijing to look for their children, who had been missing for a long time.

This time, though, four college students have involved themselves in their search - by filming a documentary for the heartbroken parents.