Man pushed in front of truck in sick attack. Picture: Twitter Source:Twitter

CCTV captured the horrific moment a man shoved a complete stranger into the path of a huge truck, in a seemingly random attack.

A sickening unprovoked attack which left a man in a critical condition has been captured by a security camera in downtown Los Angeles.

The footage shows a man wearing a lime green jumper sitting out the front of a restaurant at around 10am on Wednesday.

As a man walks down the path in front of him he jumps up and pushes him onto the road and into the path of an oncoming truck.

The victim is sent flying onto the road right under the wheel of a huge truck.

The truck was able to reverse off the victim, who witnesses said appeared to be in his 60s, however he was left with critical injuries including a collapsed lung and multiple broken bones.

The attacker was eventually tracked down after local news outlet ABC7 aired the footage and a group of firefighters recognised the man.

“It was definitely the bright neon rain jacket and the baggy pants, and just the demeanour the guy had,” firefighter Austen Johnson told the outlet.

The man was arrested by police a short time later and is facing attempted murder charges.