A suspected undercover police officer was pepper-sprayed in the face several times by other masked officers on Sunday.

An alleged police officer being pepper-sprayed. Photo: CUHK Campus Radio.

The ordeal only stopped when the suspected undercover officer showed his police warrant card, according to the DB Channel run by students and alumni of the Diocesan Boys’ School.

The injured officer – pictured with a police ID card around his neck – was then helped away from the scene by other black-clad officers. Onlookers cheered as he was escorted away.

Last month, two undercover police officers were apprehended by fellow officers at a protest. The pair were released after revealing their true identities.

The Democratic Party said around 10,000 people marched peacefully on Sunday in Sheung Shui district against cross-border trade.

Photo: Studio Incendo.

Demonstrators and residents have long criticised the influx of mainland traders pouring into the community to bulk-buy goods such as baby milk powder to resell in China.

After the march ended, some protesters remained as they chanted slogans. Police raised a blue flag warning and pointed pepper spray canisters at protesters, demanding they leave.

Photo: inmediahk.net.

Police said a round of tear gas was used at around 2:40 after a petrol bomb thrown at the local police station. At around 4:15pm, the force surrounded Sheung Shui Centre mall and searched around 50 people. They were made to kneel on the ground and put their hands on their heads.

Photo: Studio Incendo.

Dozens of arrests were made, as pepper spray was deployed against several people including the suspected undercover officer.

Large-scale protests have continued for almost seven months. Initially against a now-withdrawn extradition bill, the demonstrations have evolved into sometimes violent displays of dissent against police action, amid calls for democracy and anger over Beijing’s encroachment.

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