SAN FRANCISCO — Civil libertarian groups have backed away from threats to legally challenge the Bay Area Rapid Transit system’s wireless service shutdown last week after the agency refused a repeat amid rush-hour protests that shuttered four San Francisco stations.

The American Civil Liberties Union met with BART’s police chief late Monday even as demonstrators protested the agency’s action to block wireless reception Thursday to disrupt a planned protest against police brutality. After the meeting, ACLU attorney Michael Risher said the organization had no plans to file a lawsuit, but he remained disappointed that he didn’t extract a pledge from BART to refrain from similar tactics in the future. He said he planned to continue meeting with the agency.

The Electronic Frontier Foundation, too, said it was unlikely to file a lawsuit over the disabling of wireless reception for three hours.

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