As the young woman Wu Weida (online name) queued and entered a subway car in Beijing on Tuesday morning, she felt a hand touching her butt.

It was so crowded during rush hour that she could do nothing but turn her head around a little to see who did it. She saw the face, and during the rest of the trip, the suspect always tried to avoid her eyes.

She felt bad. As the train arrived at another station, a gray-haired male approached her, and showed her his identity as policeman.

"We have seen the whole thing," he said, "Do you want to report the case to us?" Without hesitation, she said, "Yes."

Then at the loud command of the officer saying "Take him!", another policeman came and the two of them together put the suspect under control with a pair of handcuffs.

Wu followed them to the police station and submitted her testimony. The next day, she was told that the molester was detained for 10 days.

Wu shared everything on her micro blog account, which was reposted over 45,000 times and liked over 181,000 times by Friday afternoon.

Among the comments to her micro blog, one of the hottest came from "Security Beijing", the official account of the Beijing police:

"Thank you, brave girl. Our public transport team has always been hunting wolves. And do not worry about being late for your job... We have testimony for you."

Wu had already shared the printed testimony via her micro blog account, which explained everything and asked the company to pardon her for being late for work. It stressed that the woman was helping to defend social justice and public security by reporting the case to the police.

And the hashtag of Security Beijing's microblog, namely #wolf hunt#, has already attracted 19 million views on Friday morning.

Under that hashtag they shared a recent case. A woman surnamed Han felt something strange as she took the elevator in the subway station. She turned around and saw a man taking photos from under her dress.

She scolded the man and called the police, who later caught him and found he had committed similar deeds before.

The man received the penalty he deserved.

So will anyone else engaging in similar behavior.

记者：张周项