"I think it is shocking what is happening," she said.
"We are getting a lot of telephone calls from people. We are hearing that people went down wanting to co-operate and then they were detained."
Islamic community leaders said many detainees had been living, working and paying taxes in the US for up to a decade and had families there.
"Terrorists most likely wouldn't come to the INS to register," said Sabiha Khan of the Southern California chapter of the Council on American Islamic Relations.
I feel safer already.