November 27, 2014 1:33 AM EST

Seven Hong Kong police officers have been arrested on suspicion of beating a political activist who was taking part in the city’s pro-democracy protests.

The police force stated that the officers had been arrested on suspicion of “assault occasioning actual bodily harm.”

The case concerns Civic Party member and social worker Ken Tsang, who was lead away and then assaulted by a group of police officers following clashes between protesters and police in the early hours of Oct. 15.

Caught on video by a local TV news crew, the incident instantly became a cause célèbre and severely aggravated tensions between citizens and the police.

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