NSW police have charged 23 people who were arrested at a pro-Palestine protest that descended into chaos at Port Botany late on Tuesday.

Police removed protesters from the unauthorised rally, which began peacefully but erupted with accusations of heavy-handed police treatment.

The gathering of up to 400 people was reportedly protesting the arrival at the Sydney terminal of a container ship owned by an Israeli company, as well as calling for a ceasefire in Gaza.

Footage on social media shows chaotic scenes, with police on horseback surrounded by rowdy, chanting protesters.

In one clip, a pram with a child inside can be seen surfing above the crowd as the mother tried to escape the mayhem.

Tweet from @PalestineRising

Police said they began their operation from about 6pm after learning of the protest.

Mounted officers and the riot squad were among the officers on scene.

“Approximately 400 people gathered near the boat ramp at Foreshore Road, before the group moved towards the intersection of Sirius and Foreshore Roads,” NSW Police said.

“Police issued a group move on direction, which was not complied with.

“The group continued to occupy Foreshore Road, blocking vehicle movement.

“Foreshore Road was subsequently closed in both directions, as police continued to issue move on directions to several members of the group.

“After a number of people continued to refuse police direction, 23 people were arrested before all people left the roadway about 9pm.

“All 23 people were taken to several police stations, where they were charged with the offences of fail to comply with move on direction and damage or disruption to a major facility.

“Inquiries into this incident continue under Operation Shelter.”