A police investigation into a violent alteration caught on video at Toronto's Union Station earlier this year has cleared the TTC officers involved in the incident.

The video -- which appears to show two TTC officers punching a man in the face and another man in the ribs -- was recorded by a bystander on Jan. 29 following a Toronto Maple Leafs game at the Air Canada Centre.

It was widely shared on YouTube and Facebook in March. The video sparked outrage, raising questions about the use of force by transit officers.

Toronto police launched an independent investigation into the altercation in April. That probe was completed last week, and the transit agency was told by investigators the use of force by TTC enforcement officers was justified.

No charges will be laid.

In the video, one of the men can be heard saying that he "didn't do anything" and had paid his transit fare.

TTC CEO Any Byford previously said the altercation was not prompted by a fare dispute, but it's unclear what sparked the incident.

Following the fight, Byford said two men were arrested and charged.

Police later identified them as Jamie Gillman, 33, and Russell Gillman, 63.