In this Oct. 22, 2013 file photo, Bay Area Rapid Transit passengers wait for a BART train to depart the Fruitvale station in Oakland, Calif. AP Photo/Ben Margot, File

Chaos erupted at a train station in Oakland, California, Saturday evening when dozens of people, believed to be juveniles, took over a Bay Area Rapid Transit (BART) train and allegedly robbed several people the San Francisco Chronicle reported.

Despite an increased presence at BART stations, a spokeswoman for the transit agency's police department said its extra officers were assigned to other stations when the Saturday robbery happened.

Spokeswoman Alicia Trost told Business Insider at least seven robberies took place when suspects dashed on and off the train at the Oakland Coliseum station. Some suspects allegedly held the doors while some train cars were robbed, police said.

According to a police statement, no guns or weapons are believed to have been used in the robbery, but some passengers were injured. Of the seven robberies, six took place on the train and one happened on the train platform. Stolen items included: a purse, a duffel bag and five cell phones.

As of Monday afternoon, Trost said no one had been formally identified and no arrests had been made. She could not tell Business Insider if the suspects were from the area.

According to a police statement, no one was detained at the scene. Police report all the alleged robbers left the station and scattered before police arrived.

The robbery comes at a time when BART is also in the process of installing security cameras on all BART trains after the San Francisco Chronicle previously broke the story that most train cameras were decoys. Local media reported the train targeted in Saturday's robbery did have working cameras, but it was unclear which trains had them.