Bus passengers stepped over an unconscious victim after a thug launched a vicious attack and knocked him out in Los Angeles.

Footage shows the suspect waiting outside the back door of the bus which had parked for passengers to disembark near the 5000 block of Exposition Boulevard in south LA.

A rider steps off the bus on to the street and within seconds the assailant punches him in the jaw from behind.

The suspect, dressed in black, can be seen stalking the disembarking passenger at a bus station in south Los Angeles

This is the moment the suspect launches his frenzied attack, punching the passenger in the jaw, knocking him to the ground outside the bus station in South Los Angeles

LAPD are searching for this man after he launched a frenzied attack on an unsuspecting bus passenger in south LA in mid-March

After the victim crumples to the floor, knocked out cold, the attacker stamps on his head in a vicious ending to the assault

Immediately, the unsuspecting victim crumples down, knocked unconscious, and is left wedged between the bus and the curb.

The thug then brings his foot down, stomping on the man's face, in a cruel end to the sickening assault.

The horrific attack happened in broad daylight but bystanders waiting at the station ignore the injured victim laying stunned on the city street.

Bystanders at the bus station in LA ignore the motionless man for an extended period of time

One woman even steps over him as he lay stunned on the road between the curb and the bus at the station in LA

After around 30 seconds another man comes to the victim's rescue. The victim's condition is still unknown

One rider even steps over him on her way out of the bus.

Eventually, a man who hadn't seen the attack ran over to help the motionless man. His condition is unknown.

The battery took place in mid-March but police are yet to track down the suspect.