It happened around 4 p.m., according to the Los Angeles Police Department. A group of between 30 to 50 people ran into the store grabbing merchandise off the shelves.
Video taken from inside the store showed the group, in mostly black, running through the store, knocking over displays and grabbing whatever they could before running out of the store. Police estimate the stolen goods are worth between $60,000 and $100,000.
The mall was not evacuated, police said. One man who was sprayed with bear spray was treated by paramedics.
Saturday's "flash mob" robbery is the second in Los Angeles County in the last week. On Aug. 8, a similar robbery happened at the Yves Sain Laurent store at the Americana in Glendale. A massive group ran into the store, grabbed around $300,000 worth of handbags and clothes, before getting into cars that were waiting for them nearby.
"These `flash mob' burglaries involve a large, coordinated group of individuals simultaneously rushing into the store, overwhelming staff and taking it over," authorities said. "The suspects grab as much merchandise as possible before fleeing in multiple vehicles."
A $50,000 reward has been offered for information that leads to arrests in that robbery. That crime was also captured on video, which was widely circulated.
Despite the similarities to the Glendale robbery, police said they are not yet sure if Saturday's robbery at the Topanga Mall is connected.
In a statement Saturday, Los Angeles Mayor Karen Bass called the robbery "unacceptable. Those who committed these acts and acts like it in neighboring areas must be held accountable. The Los Angeles Police Department will continue to work to not only find those responsible for this incident but to prevent these attacks on retailers from happening in the future."