A biker involved in a road fight with actor Ian Ziering says the former 90210 and Sharknado star was “unprovoked” when the brawl began.

The 59-year-old actor was seen in a video obtained by TMZ on Sunday (local time) battling with a group of mini-bikers known as the 605 Minibike Gang.

A rider involved in the altercation on Los Angeles’ Hollywood Blvd, Nocturnal, told TMZ the incident was the group’s first encounter with Ziering.

He claimed two members of the gang had attempted a legal lane split when the actor deliberately tried to prevent the riders from overtaking him.

Nocturnal and fellow rider Roy say Ziering began the fight on his own, and insist that any incidental contact was the star’s own doing.

A video filmed by Nocturnal, shot from behind Ziering’s SUV, showed the actor throwing the first punch.

The bikers speculate that the star was having a bad day, and had taken his frustrations out on them.

In a statement shared to Instagram, Ziering wrote that he had meant to “protect” himself, and blamed police for “lawlessness”.

“While stuck in traffic, my car was approached aggressively by one of these riders, leading to an unsettling confrontation. In an attempt to assess any damage, I exited my car,” Ziering wrote.

“I am relieved to report that my daughter and I are both completely unscathed, but the incident has left me deeply concerned about the growing boldness of such groups who disrupt public safety and peace.”

Ziering called for improved law enforcement responses, calling the behaviour “unacceptable”.

“This incident reinforces my belief in the importance of personal and community safety. We must address the underlying issues that lead to such disruptive behaviour and ensure that our streets are safe for everyone,” he said.

The Los Angeles Police Department is investigating the incident for felony vandalism and misdemeanour battery.