Washington (CNN) The Washington Metro board voted on Thursday to stop showing issue ads throughout its system, just a few days after Texas activist and conservative blogger Pamela Geller requested the system place ads showing cartoons of the Prophet Mohammed.

In a brief motion, the board's chairman Mort Downey, wrote only that the "Board directs management to close WMATA's advertising space to any and all issue-oriented advertising, including but not limited to political religious and advocacy advertising until the end of the calendar year."

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The board made no mention of Geller or the Mohammed cartoons. But in a statement, Geller accused the Washington Metro board of being "cowards."

"This is an end run around the First Amendment. These cowards may claim they are making people safer but I submit to you the opposite. They are making it far more dangerous for Americans everywhere. Rewarding terror with submission is defeat," Geller said.