As part of efforts to identify people to be fined and charged for their participation,investigators are calling for information on a handful of men believed to be involved in throwing the projectiles.
Police said officers attached to the force’s mounted unit came to the assistance of an officer between 1-2pm on George St near Town Hall.
“The officers and horses were then struck by projectiles,including pot plants,” police said.
In one video circulated on social media,a pot plant can be seen connecting with the head of a mounted officer,who was wearing a helmet.
Protesters can be heard chanting “you serve us” and angrily yelling at six mounted officers,who were surrounded by the crowd.
After the plant hits the officer’s head,there are cheers from the crowd and further objects,including water bottles and another plant,are thrown at the officers.