The hacktivist group Anonymous took its fight off the internet and onto the streets San Francisco on Monday evening in its continuing protest against BART

Anonymous helped organize the demonstration, which came one day after it claimed responsibility for hacking into to steal the personal information of 2,400 BART users. The data included names, email addresses and passwords, and in some cases home addresses and phone numbers, according to BART. This was in protest at BART's decision to shut off mobile services at some of its stations at the weekend.

Meanwhile, Monday's street protest, which began at the Civic Center station, resulted in authorities temporarily closing four BART stations in central San Francisco. All of the stations eventually reopened Monday night. There were roughly 100 demonstrators walking from station to station, according to police.

Meanwhile, advocacy groups, such as the Electronic Frontier Foundation, compared BART's shutting off mobile signals to that of the former regime in Egypt, which disabled internet service to protesters for several days in January.

"One thing is clear...cutting off cell phone service in response to a planned protest is a shameful attack on free speech," said the EFF statement. "BART officials are showing themselves to be of a mind with the former president of Egypt, Hosni Mubarak, who ordered the shutdown of cell phone service in Tahrir Square in response to peaceful, democratic protests earlier this year."

The Federal Communications Commission is investigating, according to reports.