A boy has been charged after a shocking video emerged showing an elderly man allegedly being pushed off the edge of a Melbourne pier.

The video, believed to have been filmed on Sunday night and shared on social media, shows three teenagers walking along Mornington Pier.

WATCH THE VIDEO ABOVE: Cruel alleged attack on elderly man triggers police hunt.

Watch the latest news and stream for free on 7plus >>

As they approach a man standing on the edge of the pier, one of the teens can be heard in the video saying: ‘Go, go, go’.

Another one of the boys allegedly pushes the man in his chest into the water below.

Police said officers were called to reports a man was allegedly assaulted and pushed into the water at about 11.30pm on Sunday.

“He was not seriously injured and was pulled from the water by onlookers,” police said.

Onlookers told 7NEWS the man could not swim, but others were around to rescue him.

Local teacher Val said her granddaughter, who is a young teenager, sent her the video and told her she and her friends were now scared to visit the pier.

Disability support worker Matty Mayne slammed the act as “disgusting”.

“It was just a big cowardly act, disgraceful,” he told 7NEWS.

The trio uploaded the video to Facebook, making no attempt to hide their names or identities. However, the young people have since changed their usernames and deleted profile pictures in a bid to remain anonymous, but it is too late.

Police on Tuesday charged a 14-year-old boy on summons with reckless endangerment and unlawful assault.

He will appear before a children’s court at a later date.

– With Bethan Yeoman