SAN FRANCISCO (CBS SF) — A YouTube video shows a man attacking a cab driver with a padlock in San Francisco Monday.

The cab driver’s dashboard camera recorded the moments before and during the attack.

In the two minute video, the cab driver asks the passenger if he wants to get dropped off at a closer BART station, which would save him some money. The passenger responds “right on.” A few moments pass. Then he starts to reach for something on the side of his leg. The padlock becomes visible, and he starts to swing it on his finger. The cab driver asks “what do you got going on back there?” In that moment, the passenger begins hitting the driver in the head with the lock.

The driver screams, “what the f**k, no, no, no,” and the video abruptly ends.

WARNING: Video contains disturbing content and explicit language

YouTube user Cognizant Dissident published the video claiming to be the taxi driver’s friend. In the video description, he or she said the assailant mentioned living in Fruitvale within ten blocks of the BART station “though this could obviously be a lie.”

KPIX 5 has reached out to the San Francisco Police Department to confirm the attack. As of 7:30 a.m., police have acknowledged the video are checking with investigators to provide more information.

Check back soon for more updates.