Police arrested a couple for allegedly stealing audio-visual products from a shop in Mong Kok in Kowloon on Thursday after the owner of the store received a tip-off from a netizen who saw his posting about the crime on social media.

At 10pm on Sunday, a man and a pregnant woman were caught by a surveillance camera in an audio and visual store on Sai Yeung Choi Street South when they stole four products worth around HK$600 (US$76), Headline Daily reported.

When the store owner realized that one of the thieves was pregnant, he became concerned that if he reported the case to police, the baby might be born in prison or grow up away from the care of its parents.

Instead of calling the police, the store owner posted the CCTV footage on social media, noting that he hoped the couple would return or pay for the products by 6pm on Monday. If they did not do so, he said he would report the case to the police.

The store owner also said that a reward of HK$4,000 (US$509.50) would be paid to anyone who could tell him the whereabouts of the alleged thieves.

At 11am on Thursday, the store owner received a call from a man claiming that he had spotted the suspects in Langham Place in Mong Kok.

His store manager went to Langham Place and intercepted the couple, who wore the same outfits as when the alleged theft occurred.

Police officers arrived and arrested the couple, a 45-year-old man surnamed Tsang and his girlfriend, a 35-year-old pregnant woman surnamed Lai, for alleged theft.

Lai was also arrested for possession of illegal drugs as officers found that she was carrying four grams of methamphetamine and a small quantity of zopiclone.