Police seeking Sydney protesters after pot plants thrown at officers

Police have released images of four men they want to identify after pot plants were thrown at mounted officers during an anti-lockdown protest in Sydney at the weekend.

Thousands of protesters gathered unlawfully in the CBD to oppose the city's lockdown on Saturday.

NSW Police said officers on horseback came to the aid of another officer during the protest near Town Hall on George Street, when they were struck by "projectiles" including pot plants, between 1pm and 2pm.

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The first man wore a hat, sunglasses and what appeared to be a purple scarf, with a grey and green-coloured jacket, dark jeans and grey shoes.

The second man wore sunglasses on top of his head, a black face mask, black jacket, grey shorts, black socks and grey shoes.

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The third man had a dark-coloured cap, jumper, jeans and shoes, as well as a black face mask and carried a black backpack.

The fourth man wore a blue tracksuit and dark-coloured cap and shoes.

Police warned investigators were "following up every report" relating to people who breached health orders and attended the protest.

So far, 59 people have been charged and 151 infringement notices have been issued.

"Police continue to appeal to the community to report suspected breaches of any public health order or behaviour which may impact on the health and safety of the community," NSW Police said.

Anyone with information about the identity of the four men – or has mobile phone footage of the protest activity – is urged to contact Crime Stoppers.