(CNN) -- Members of a well-known hacking group -- according to a statement and Twitter messages -- took credit Sunday for an online attack targeting San Francisco's embattled transit system. Anonymous -- in a news release attributed to the group, and backed up by related Twitter pages -- said it would take down the website of the Bay Area Rapid Transit System, known as BART, between noon and 6 p.m. PT Sunday. This is in response to the system's decision to cut off cellphone signals at "select" subway stations in response to a planned protest last week. "By (cutting cell service), you have not only threatened your citizens' safety, you have also performed an act of censorship," a seemingly computer-generated voice -- speaking over dramatic music and images -- said in a video posted online Sunday afternoon. "By doing this, you have angered Anonymous."
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NEW: A video urges protesters Monday to wear red shirts and record the event
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Statements attributed to Anonymous promised an online attack Sunday on BART
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MyBART.gov appears Sunday to have been hacked
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The system said it was prepared for hacks, as well as a planned protest Monday
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It showed a page featuring, among other items, the @placeholder logo -- a smirking mask above two crossed swords, all on a black background.
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In addition, Twitter traffic related to @placeholder boasted that hackers had been able to get into BART's internal network.
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"We're doing what we can to defend against any attack on the @placeholder website," the system said.
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In recent years, the hacking collective calling itself @placeholder has targeted several organizations to make political statements.