YERBA BUENA ISLAND (CBS SF) — Drivers were backed up for miles early Sunday evening when a group of drivers blocked off all eastbound lanes of the Bay Bridge to hold a sideshow on the span.

CHP confirmed that the incident happened shortly after 6 p.m. A group of five cars slowed down in unison and blocked off all eastbound lanes just as traffic emerges from the Yerba Buena Tunnel.

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Instagram user “Bay Area Movement” posted video of the sideshow. It shows a black car doing donuts as tires squeal and rubber burns. According to media reports, CHP estimate 50 cars were involved in the sideshow.

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There were no injuries and no one was arrested as a result of the incident, according to authorities.

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CHP is investigated who was behind the sideshow and told KPIX 5 they have obtained a license plate number to one of the vehicles involved.